[1] The battalions of the four Hispanic-American countries were equipped and transported by the U.S. military, and received some specific training in Germany prior to their arrival to the Persian Gulf.

There was only one serious incident, a skirmish with insurgents in early April 2004 in Najaf, which left one Salvadoran soldier dead and at least 19 Iraqis killed.

[2] The Rules of Engagement that the units followed were very restrictive and the authorization to use deadly force needed high command clearance, due to a directive seeking to "avoid or minimize at all costs collateral damage to people or property".

The lack of public support for the deployment and the war in Iraq was cited as the main reason, with Nicaragua, additionally stating its financial constraints.

[8] On July 23, 2003, the Airport of Santiago de Compostela where the first Boeing 707 that would leave with the first Spanish contingent of 60 troops heading for Kuwait, where later it will be established in Iraq, creating and preparing camps in the Cities of Dīwānīyah and Najaf.

Later on, they would join the 1200 Central American troops to help the Spanish in the reconstruction of the Country, taking the Brigade the relay of the marines of the United States on August 28.

The last 260 Spanish soldiers of the II Plus Ultra Brigade arrived in Kuwait on the afternoon of April 27, thus completing the exit from Iraq of all units.