In the afternoon of March 1st, 1476, the Portuguese forces clashed with the Castilian forces under don Fernando at Peleagonzalo, a small town between Toro and Zamora, in a plane next to the river Duero.
The Spanish forces numbered around 30,000 and the Portuguese around 40,000. After several hours of battle, from about noon until sun down, the Portuguese divided their forces. Alfonso V fled, seeking the safety of the city walls of Toro with his men. His son and what was left of his forces retreated towards the Portuguese border. As the Portuguese moved through the Sayago area, as many as 350 Portuguese soldiers were captured by the local defensive militia and were castrated before they were allowed to continue moving back towards Portugal. That was pay back for the way they behave on their way into Spain. Queen Isabel chastised her husband and her soldiers for not pursuing and fighting the Portuguese until they were completely destroyed. According to tradition, one of the church officials commented that Isabel wore her pants better than the men! She had even suffered a miscarriage while riding from town to town raising money and volunteers for her army.
Three months later, King Alfonso V retreated towards Oporto. The military invasion of Castile had failed. Isabel and Fernando had won the war. The towns and villages of along the Duero, on the other hand, were left under populated by the thousands of casualties of the war and the economic damage of the plundering armies. Executions of those who had supported the Portuguese were common.
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