The U.S. 4th Army(English: U.S. IV ) was a corps of the United States Army during .
The 4th Corps was founded October 20, 1939 and continued until March 1944 in the United States.
In the summer of 1944 the 4th Army Corps replaced theCorps in the . Originally, the 4th Corps of the and the South African 6th . They were strengthened in November with the 1st Brazilian , in February 1945 with the and in April 1945 with the 85th Division.
The 4th Corps was commanded by-General Willis D. Crittenberger involved in the Italian campaign. It tore in the summer of 1944 towards the River Arno and played a small role in the breakthrough of the .
In the spring of 1945 the 4th Corps took part in the Spring. They crossed the Apennine Mountains and surrounded with the British Army Achtse the German Tenth and Fourteenth Armies Bologna defended. The 4th Corps then pushed on towards Verona and Brescia.
On 13 October 1945, the 4th Army Corps disbanded.
Military unit of the U.S. Army in