The Sirte , Tmed Hassan and Buerat strongholds were reinforced Cause_change_of_strength from Italy , which brought Bringing the 10th and 5th armies up to about German reinforcements were sent Sending to Libya to form Coming_to_be a blocking detachment ( ) under Directive 22 ( 11 January ) , these being the first units of the `` Afrika Korps '' ( `` Generalleutnant '' Erwin Rommel ) .