Why did President Truman believe that he could send U.S. armed forces to help South Korea, even though Congress had not officially declared war on North Korea?

Question

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Although Congress had not declared war on North Korea, President Truman believed he could send U.S. armed forces to help South Korea simply because of the power belonging to the President, as granted by the Constitution.
Key Takeaway: According to the power of the Constitution, the President has complete power over armed forces and whether or not to send troops into combat. So although Congress did not officially declare war on North Korea, President Truman could send armed forces to help South Korea when North Korea attacked the South in 1950. An armistice agreement was signed in 1953 near the village of Panmunjoun, temporarily stopping the fight. There has never been a formal peace agreement.

Why Did President Truman Believe That He Could Send U