Its members were mostly Polish, but there was also a Spanish battalion, as well as a Hungarian section.

The CL International Brigade took part in the Battle of Brunete in July as part of the 45th Division, also known as "45th International Division", led by Kléber.

Most of the men of the defunct unit ended up in the XIII International Brigade.

[3] The postal service of the Polish People's Republic issued two stamps in 1946 and one in 1966 commemorating the Brigada Dombrowski.

Some of the battalions of the CL International Brigade were transferred from other units, while others were established anew.