 Lion 's starboard engine was temporarily shut down due to contaminated feed water , but it was restarted and Lion headed home at 10 knots ( 12 mph ; 19 km / h ) when the rest of the battlecruisers caught up with her around 12 : 45 . At 2 : 30 the starboard engine began to fail and her speed was reduced to 8 knots ( 9 @.@ 2 mph ; 15 km / h ) . Indomitable was ordered to tow Lion back to port at 3 : 00 , but it took two hours and two tries before she could start to tow Lion , and a further day @-@ and @-@ a @-@ half to reach port at speeds of 7 – 10 knots ( 8 @.@ 1 – 11 @.@ 5 mph ; 13 – 19 km / h ) , even after Lion 's starboard engine was temporarily repaired . 
