delivered the opinion of the Court.
This case comes here on certiorari to resolve a question arising under the Longshoremen’s and Harbor Workers’ Compensation Act of March 4, 1927, 44 Stat. 1424, made applicable to the District of Columbia by the Act of April 17, 1928, 45 Stat. 600.
*528 Petitioner sought, in the Supreme Court of the District of Columbia, a mandatory injunction directing respondent, a Deputy Commissioner of the District of Columbia Compensation District, to award him compensation. In the proceedings in that court it appeared that petitioner had been injured in a collision with a street car, in the course of his employment as helper on a delivery truck of his employer, for whom the respondent, The Indemnity Insurance Company of North America, intervenor in the suit, is the insurance carrier: that petitioner, electing to sue the street car company, had recovered judgment in the District Supreme Court, which the District Court of Appeals had reversed and remanded for further proceedings, Washington Ry. & Electric Co. v. Chapman, 62 App. D. C. 140; 65 F. (2d) 486: that petitioner had then discontinued his suit and pressed his application for compensation before the Deputy Commissioner who denied it on the ground that petitioner had failed to pursue to final judgment his remedy against the third party. The present suit was dismissed by the District Supreme Court on motion of the Insurance Company. The Court of Appeals affirmed, 64 App. D. C. 349; 78 F. (2d) 233, holding that, as the petitioner had elected to pursue his remedy against the third party, and as the statute of limitations had run while the suit was pending, his failure to proceed to final judgment operated to discharge the employer and the insurance carrier.
While by § 33 (a) of the Compensation Act the employee may elect to pursue his remedy against a third person, election does not deprive him of his right to compensation. See American Lumbermen’s Mutual Casualty Co. v. Lowe, 70 F. (2d) 616. By § 33 (f) the employer or the insurance carrier who, by §§ 32 (a), 35 and 36 is substituted for the employer, remains liable for any amount by which the recovery against the third person falls short of the prescribed compensation, Section 33 (a) only pro *529 vides for release of the employer’s liability for compensation when the claim against the third party is compromised without the employer’s consent. In other respects his rights and liabilities, so far as he is in the position of a surety or indemnitor, are governed, as the court below held, by the general principles of suretyship.
Upon election of the employee to take compensation the employer is entitled to be subrogated to the rights of the employee against the third person. The insurer, who, as an indemnitor of the employer, and by the Act, stands in the place of the employer, is similarly entitled to subrogation. As with other indemnitors, his obligation may be discharged by release or other relinquishment of the principal liability which deprives him of his right of subrogation.
Aetna Life Insurance Co.
v.
Moses,
Whether, in any case, an indemnitor is discharged by the mere failure of his obligee to sue the principal debtor until suit is barred by the statute of limitations, remains an open question in this Court. See
Nelson
v.
First Nat. Bank,
It is generally true that the obligation of a voluntary surety is so far regarded as
strictissimi juris
as to be released upon a showing, without more, that the principal obligation has been modified or surrendered without the consent of the surety.
Sprigg
v.
Bank of Mt. Pleasant,
This follows from the fact that the surety’s contract, not being one of guaranty, does not entitle him to have the creditor first assert his claim against the principal debtor.
*531
Failure by the creditor to perform any obligation to prosecute the claim arising out of his conduct subsequent to the contract, like his failure to realize upon subsequently acquired security, is a defense only so far as it is prejudicial to the surety. See
State Bank
v.
Edwards,
Moreover, respondent is a compensated surety, whose premiums the employer is required to pay by § 32. The rule that any modification of the principal obligation releases the surety is also abated in the case of a compensated surety or indemnitor, who is discharged only so far as his right is shown to be in fact prejudiced by action of the indemnitee. One who engages in the business of insurance for compensation may properly be held more rigidly to his obligation to indemnify the insured than one whose suretyship is an undertaking uncompensated and casual.
Atlantic Trust & Deposit Co.
v.
Laurinburg,
Application of these principles to an insurance contract under a compensation act such as the present does not require that an employee who has elected to proceed against a third person do more than prosecute his claim in a manner and to an extent which will avoid prejudice to the insurer’s right of subrogation. The facts disclosed show that respondent has not been prejudiced. The judgment upon the first trial was set aside by the Court of Appeals because uncontradicted evidence established petitioner’s contributory negligence so clearly that the trial judge should have directed a verdict for the defendant. The appellate court was nevertheless required by the rule of
Slocum
v.
New York Life Insurance Co.,
Reversed.
