The Battle of Acajutla was a battle on June 8, 1524, between the Spanish conquistador Pedro de Alvarado and the standing army of Cuscatlan Pipils, an indigenous state, in the neighborhood of present-day Acajutla, near the coast of western El Salvador.
Hernán Cortés, after conquering the city of Tenochtitlan, capital of the Aztec empire, delegated the conquest of the territories southward to his lieutenant Pedro de Alvarado, who set out with 120 horsemen, 300 foot soldiers and several hundred Cholula and Tlaxcala auxiliaries. After subduing the highland Mayan city-states of present-day Guatemala through battle and co-optation, the Spanish sought to extend their dominion to the lower Atlantic region of the Nahuat-speaking people whom his translators called Pipils, then organized as the powerful state of Cuzcatlán. The Kaqchikel Mayans, who had long been rivals of Cuscatlán for control over their wealthy cacao-producing region, joined forces with Alvarado's men and supported his campaign. Accompanied by thousands of Kaqchikel warriors, Alvarado then marched on Cuscatlán. The army arrived at the present territory of El Salvador, across the Paz River, on June 6, 1524. Receiving word of the approaching Spanish forces, the Nahuat peasants who lived nearby fled.
On June 8, 1524, the conquerors arrived in the neighborhood of Acajutla at a village called Acaxual. There, according to records, a battle ensued between the opposing armies, with the Nahuat wearing cotton armor (of three fingers' thickness, according to Alvarado) and carrying long lances. This circumstance would be crucial in the progression of the battle. Alvarado approached the Pipil lines with his archers' showers of crossbow arrows, but the natives did not retreat. The conquistador noticed the proximity of a nearby hill and knew that it could be a convenient hiding place for his opponents. Alvarado pretended that his army had given up the battle and retreated. The Pipils suddenly rushed the invaders, giving Alvarado an opportunity to inflict massive losses. The Pipils that fell to the ground could not get back on their feet, hindered by the weight of their cotton armor, which enabled the Spanish to slaughter them. Decimated, the Nahuat forces retreated to reassemble further along his route. In a second battle a few days later, the remaining formal Cuscatlan army again assembled on the battlefield but was finally defeated. In the words of Alvarado: "...the destruction was so great that in just a short time none were left alive...".