A more thorough explanation:

Definition: A stratagem is a trick or deception used to gain an advantage, especially in a military conflict.

Example 1: During World War II, the Allies used a stratagem to deceive the Germans about the location of the D-Day invasion. They created a fake army and made it seem like they were going to invade at a different location, which distracted the Germans and allowed the real invasion to be successful.

Example 2: In a game of chess, a player might use a stratagem by sacrificing a piece to distract their opponent and create an opportunity to attack.

These examples illustrate how a stratagem involves using deception or misdirection to gain an advantage. It can be used in various contexts, not just in military conflicts.