Jellicoe and his commanders did not understand that the furious gunfire and explosions to the north (seen and heard for hours by all the British battleships) indicated that the German heavy ships were breaking through the screen astern of the British fleet. Instead, it was believed that the fighting was the result of night attacks by German destroyers. The most powerful British ships of all (the 15-inch-guns of the 5th Battle Squadron) directly observed German battleships crossing astern of them in action with British light forces, at ranges of or less, and gunners on HMS "Malaya" made ready to fire, but her captain declined, deferring to the authority of Rear-Admiral Evan-Thomas – and neither commander reported the sightings to Jellicoe, assuming that he could see for himself and that revealing the fleet's position by radio signals or gunfire was unwise.