In February 1941, the headquarters of the Army of the Po (Sixth Army) was transferred to southern Italy. On 1 March, the Armoured Corps became the XVII Corps and deployed to Albania as an infantry command. All three of the former corps of the Sixth Army took part in the invasion of Yugoslavia in April. In July 1943, the headquarters of the Sixth Army took charge of the defence of Sicily. The 6th Army suffered heavy losses against the Allies in July–August 1943 and withdrew to northern Italy for reorganization. It capitulated to the Germans upon the surrender of Italy in September 1943.