delivered the opinion of the court:
At the conclusion of a bench trial in the criminal court of Cook County, the defendant, Herbert Laws, was found guilty of the unlawful sale of narcotic drugs and was sentenced to the penitentiary for a term of not less than ten nor more than twelve years. He prosecutes this writ of error contending that the trial court erred, and deprived him of his constitutional rights, when it denied his motion for discharge on the ground of former jeopardy.
Pertinent facts show that defendant was indicted on November 10, i960, and that he entered a plea of not guilty when arraigned. Subsequently, he was permitted *223to withdraw such plea and to file a motion to quash the indictment, but the motion was later denied. Although no further or new plea had been entered, trial was commenced on December 6, 1961, and after defendant had waived a jury the prosecution called its witnesses, presented its entire case and rested. At this stage defense counsel pointed out that the clerk’s memorandum of an order entered at the start of trial incorrectly stated: “Plea of not guilty heretofore entered,” and upon his motion, consented to by the prosecution, the record was corrected to show that no plea had been entered. Following this an assistant State’s Attorney moved for a mistrial, stating “there never was a trial at all in view of the fact no plea was entered,” and over defendant’s objection a mistrial was declared. Defendant was then arraigned, his counsel agreed to accept the same list of witnesses to an oral confession, and the cause was continued.
At the time the mistrial was declared, we digress to state, it is patent that both the court and counsel were unaware of our decision in People v. Hill, 17 Ill.2d 112, filed in May, 1959, wherein we held that under circumstances comparable to those of the present case, the entry of a formal plea of not guilty was not essential to a valid judgment.
After various motions and extended hearings during which the prosecution, now fully aware of the Hill decision, unsuccessfully sought to vacate the order for a mistrial, a change of venue was granted to defendant and the case assigned to another judge. When a second trial was commenced in June, 1962, defendant filed a motion for discharge alleging that the second trial would subject him to double jeopardy and thus violate his constitutional rights, but such motion was denied, after which the trial continued to completion and resulted in conviction. The principal issue before us is the correctness of the court’s ruling on the motion for discharge.
*224Although advanced to us as an alternative proposition, our attention must necessarily be directed first to a contention of the People that the motion was properly denied because defendant was not in fact put in jeopardy upon the occasion of the first trial. The theory advanced is that issue must be joined before jeopardy can attach, and that issue had not been joined in the first proceeding since defendant’s plea of not guilty had been withdrawn and not renewed when trial commenced. However, any validity of such a theory has vanished with our decision in People v. Hill, 17 Ill.2d 112, wherein we aligned ourselves with those jurisdictions which hold that the requirement of arraignment and plea in criminal trials is a mere formality, and inessential to a valid judgment of conviction in the absence of a showing that rights of the defendant were m some manner adversely affected by such omission. Under this rule arraignment and plea are not necessary for jeopardy to attach. (Clawans v. Rives, (D.C. cir.) 104 F.2d 240, 242; 22 C.J.S. Criminal Law, sec. 247.) But where, as here, a case is heard without a jury, jeopardy attaches when the accused is subjected to a charge and the court has begun to hear evidence. (Hunter v. Wade, (10th cir.) 169 F.2d 973, McCarthy v. Zerbst, (10th cir.) 85 F.2d 640. From what is shown in the record it is unquestionable that defendant had been placed in jeopardy upon the first trial.
Section 10 of article II of the Illinois constitution provides that: “No person shall * * * be twice put in jeopardy for the same offense.” The fifth amendment to the United States constitution, the commands of which are made binding on the States by the due-process clause of the fourteenth amendment, makes substantially the same provision. It is settled, however, that to be twice tried for the same offense is not necessarily to be twice put in jeopardy, and under a variety of circumstances, including instances where the first proceeding has ended in a *225mistrial, our courts have held that a second trial does not give rise to a claim of double jeopardy. See: People v. Friason, 22 Ill.2d 563; People v. Thomas, 15 Ill.2d 344; Himmelfarb v. United States, (9th cir.) 175 F.2d 924.
The question whether a subsequent trial, after an earlier trial has ended in a mistrial, constitutes double jeopardy usually depends on whether the court acted properly in declaring a mistrial. In deciding the latter issue we have consistently adhered to the elastic rule first laid down in United States v. Perez, 9 Wheat. 579, 6 L. ed. 165, viz., that a court has authority to discharge a jury or declare a mistrial, without giving rise to a claim of double jeopardy, whenever in the court’s opinion “there is a manifest necessity for the act, or the ends of public justice would otherwise be defeated.” (See: People v. Friason, 22 Ill.2d 563; People v. Touhy, 361 Ill. 332; People v. Simos, 345 Ill. 226.) And while recognizing that the ruling of the trial court granting a mistrial is not subject to review in the absence of an abuse of discretion, (People v. Thomas, 15 Ill.2d 344, 348), we have also heeded the admonition of Perez that “the power ought to be used with the greatest caution, under urgent circumstances, and for very plain and obvious causes * * *.” See: People v. Friason, 22 Ill.2d 563, 566; cf. Downum v. United States, 372 U.S. 734, 10 L. ed. 2d 100.
It emerges clearly from the record in the instant case that the sole ground for declaring the mistrial was the mistaken belief that arraignment and a plea of not guilty were necessary before there could be a valid trial and judgment. This was not the law, and had not been the law since our opinion in People v. Hill, 17 Ill.2d 112, which.was filed in excess of 18 months before the defendant here was tried. Such being the case, neither manifest necessity nor the ends of justice required or justified the mistrial, for under Hill a plea of not guilty was not essential to a valid trial or a valid judgment. The constitutional guaranty against double *226jeopardy is one that is deeply rooted in our system of jurisprudence, (People v. Peplos, 340 Ill. 27; Green v. United States, 355 U.S. 184, 2 L. ed. 2d 199,) and may not be needlessly or lightly frittered away. Under the circumstances here, where the trial could have proceeded to a valid judgment, it is our opinion that it was an abuse of discretion to declare a mistrial. The constitutional prohibition against double jeopardy, it was observed in United States v. Ball, 163 U.S. 662, 669, 41 L. ed. 300, 302, is “not against being twice punished, but against being twice put in jeopardy.” This is precisely what happened to the defendant in this case.
Citing Gori v. United States, 367 U.S. 364, 6 L. ed. 2d 901, wherein the high court refused to review the propriety of the trial court’s action because it was plain the mistrial had been declared out of solicitude for the accused, the People urge that the mistrial here was “in the sole interest of the defendant,” and thus could not constitute an abuse of discretion or a bar to a second trial. This contention is completely without support in the record. The mistrial was granted over defendant’s objection, and the circumstances under which it was declared admit of little doubt that the action was taken for the convenience and protection of the prosecution. Surely it was not in the “sole interest” of defendant to permit the prosecution to start over for a purpose of insuring that a valid judgment of conviction could be entered against him.
In like manner the suggestions of the People that defendant consented to the mistrial, that he waived his right not to be put in jeopardy twice and that the declaration of the mistrial came as the result of defendant’s own action, find no support in the record. They are arrived at by ignoring defendant’s objections to the order of mistrial, and by attributing to defendant a clairvoyant power to predetermine that the prosecution would seek and be granted a mistrial.
*227For the reasons stated, we conclude that it was error to deny defendant’s motion for discharge. Accordingly, the judgment of the circuit court of Cook County is reversed.
Judgment reversed.