Major-General Sir Denis Pack KCB (7 October 1775 – 24 July 1823) was a British Army officer who served in the French Revolutionary and Napoleonic Wars.

However, in the second week of August 1806, Santiago de Liniers would begin one of the most important events of Argentine History, reconquering the city and overcoming the English.

Pack violated his oath, taking active part in the occupation of Colonia del Sacramento, which made the attack by Colonel Francisco Javier de Elío fail.

The people were looking for Pack to execute him for perjury, but the Dominican friars protected him until he was delivered to General John Whitelocke, at the beginning of the English retreat.

During the Peninsular War he was present at the battles of Roliça, Vimiero, A Coruña, Bussaco, Ciudad Rodrigo, Salamanca, Vitoria, the Pyrenees, Nivelle, Nive, Orthez and Toulouse.