Ritchie proved unable to halt Rommel and was replaced when Auchinleck himself took direct command of the army. The Panzer Army Afrika were eventually stopped by Auchinleck at the First Battle of El Alamein. Auchinleck, wishing to pause and regroup the Eighth Army, which had expended a lot of its strength in halting Rommel, came under intense political pressure from British Prime Minister Winston Churchill to strike back immediately. However, he proved unable to build on his success at Alamein and was replaced as Commander-in-Chief Middle-East in August 1942 by General Harold Alexander and as Eighth Army commander by Lieutenant-General William Gott. Gott was killed in an air crash on his way to take up his command and so Lieutenant-General Bernard Montgomery was appointed in his place. Alexander and Montgomery were able to resist the pressure from Churchill, building the Army's strength and adding a pursuit formation, X Corps, to the Army's XIII and XXX Corps.