Battle of the Trench enemy in the open (which led to victory at Badr), and waiting for them inside the city (a lesson learnt from the defeat at Uhud) were both suggested. Ultimately, the outnumbered Muslims opted to engage in a defensive battle by digging deep trenches to act as a barrier along the northern front. The tactic of a defensive trench was introduced by Salman the Persian. Every capable Muslim in Medina including Muhammad contributed to digging the massive trench in six days. The ditch was dug on the northern side only, as the rest of Medina was surrounded by rocky mountains and
Army of the Three Guarantees Three Guarantees was created on February 24, 1821, and continued battling Spanish royalist forces which refused to accept Mexican independence. These battles continued until August 1821, when Iturbide and Spanish Viceroy Juan de O'Donojú signed the Treaty of Córdoba, virtually ratifying Mexico's independence. The Army was a decisive force during the Battle of Azcapotzalco. The victory in this last battle of the war cleared the way to Mexico City. On September 27, 1821, the Army of the Three Guarantees triumphantly entered Mexico City, led by Iturbide. The following day Mexico was declared independent. By that time, the Army of the