The aircraft was damaged by the U-boat's flak .
The pilot warned an arriving United States Navy Catalina patrol bomber of Squadron VP - 84 that the boat would stay up and fight , so the flying boat shadowed U-535 until it escaped at dusk .
The aircraft was damaged by the U-boat's flak , and the pilot warned an arriving United States Navy Catalina patrol bomber of Squadron VP - 84 that the boat would stay up and fight , so the flying boat shadowed U-535 until it escaped at dusk .