Pizarro used the capture of Atahualpa to gain gold as a ransom. Atahualpa offered the Spaniards enough gold to fill the room he was imprisoned in, and twice that amount of silver. The Incas fulfilled this ransom. Over four months, almost 8 tons of gold was collected. Pizarro was supposed to let the ruler of the Incas free once the ransom was paid, but he refused to release the Inca after that and instead had him strangled in public. During Atahualpa's imprisonment Huáscar was assassinated. The Spanish maintained that this was at Atahualpa's orders; this was one of the charges used against Atahualpa when the Spanish finally decided to put him to death, in August 1533.