By 18:30, the main battle fleet action was joined for the first time, with Jellicoe effectively "crossing Scheer's T". The officers on the lead German battleships, and Scheer himself, were taken completely by surprise when they emerged from drifting clouds of smoky mist to suddenly find themselves facing the massed firepower of the entire Grand Fleet main battle line, which they did not know was even at sea. Jellicoe's flagship "Iron Duke" quickly scored seven hits on the lead German dreadnought, , but in this brief exchange, which lasted only minutes, as few as 10 of the Grand Fleet's 24 dreadnoughts actually opened fire. The Germans were hampered by poor visibility, in addition to being in an unfavourable tactical position, just as Jellicoe had intended. Realising he was heading into a death trap, Scheer ordered his fleet to turn and disengage at 18:33. Under a pall of smoke and mist, Scheer's forces succeeded in disengaging by an expertly executed 180° turn in unison ("battle about turn to starboard", German "Gefechtskehrtwendung nach Steuerbord"), which was a well-practised emergency manoeuvre of the High Seas Fleet. Scheer declared: