infantry units isolated on hilltops. Combat Command C was ordered across country to relieve Sidi Bou Zid but were repelled with heavy losses. By the evening of 15 February, three of the Axis battlegroups were able to head toward Sbeitla, to the northwest. Pushing aside the remains of CCA and CCC, the battlegroups were confronted by Combat Command B in front of Sbeitla. With the help of air support, CCB held on through the day. However, the air support could not be sustained and the defenders of Sbeitla were obliged to withdraw and the town lay empty by midday on 17 February. To the south, in Operation Morgenluft ("morning air"), an Italian First Army battlegroup made up of the remains of the Afrika Korps under Karl Bülowius had advanced toward Gafsa at dusk on 15 February to find the town deserted, part of a withdrawal to shorten the Allied front to facilitate a reorganisation involving the withdrawal of French XIX Corps in order to re-equip. II US Corps withdrew to the line of Dernaia-Kasserine-Gap-Sbiba with XIX Corps on their left flank vacating the Eastern Dorsal to conform with them. By the afternoon of 17 February, Rommel's troops had occupied Feriana and Thelepte (roughly southwest of Kasserine) forcing the evacuation on the morning of 18 February of Thelepte airfield, the main air base in British First Army's southern sector. Battle of Kasserine Pass After further discussion, the Comando Supremo issued orders on 19 February for Rommel to attack through the Kasserine and Sbiba passes toward Thala and Le Kef to threaten First Army's flank. Rommel's original proposal was for a limited but concentrated attack through Kasserine to confront II Corps' strength at Tébessa and gain vital supplies from the US dumps there. Although he was to have 10th and 21st Panzer Divisions transferred to his command, Rommel was concerned that the new plan would dilute his force concentration and expose his flanks to threat. On 19 February 1943, Rommel, having now been given formal control of the 10th and 21st Panzer Divisions, the Afrika Korps battlegroup as well as General Messe's forces on the Mareth defences (renamed Italian First Army), launched what would become the Battle of Kasserine Pass. Hoping to take the inexperienced defenders by surprise, he sent the light armour of the 3rd Reconnaissance Battalion racing into the pass. Colonel Alexander Stark's Stark Force, a brigade group made up