Crossing the Tee.

A century ago crossing the Tee was the battle winning naval maneuver.   Warships, (battleships mostly) traveled in line ahead, each ship followed the ship ahead of it.  Full firepower was available to both sides, the guns were all mounted in turrets that could traverse 180 degrees.  Dead ahead, not so good.  Only the lead ship could fire dead ahead.  The ship behind the lead ship could fire somewhat to port or to starboard, but could not fire dead ahead lest it hit the ship leading the line ahead.   

   To cross the enemy's Tee you brought your line ahead fleet in front of, and at right angles to, the enemy.  Then was all of your guns could fire on the enemy and only the few forward guns of the enemy lead ship, four or maybe six, could return fire.  

The classic maneuver was used at Jutland, the first and only head to head clash of modern battleship fleets.  Canny old admiral Jellicoe, commanding the British fleet, managed to cross the German's Tee twice that day.  Crossing the Tee remained an important maneuver up and thru World War II when the aircraft carrier became the important capital ship.  Carriers were expected to stay well out of gun range of an enemy fleet and let her aircraft do the work.