Erwin Rommel was an innovative German tactician respected even by enemies. He divided his tank forces into small, fast, flexible units rather than large slow units like the British. He also used decoy "mock-up" tanks to deceive the British about his tank numbers. Rommel personally flew small aircraft to observe his divided units on the battlefield. He was also known for politely interrogating prisoners of war without them realizing it. He utilized any available resources, such as anti-aircraft guns, against ground targets.