Roosevelt was angry with the troopers at first because they were not paying heed to his instructions.
According to the passage, after he saw the Spaniards running and the Americans rushing after them, he called his troops and tried to stop them so they won't injure their fellow Comrades.
He gave them instructions that they should charge other trenches. According to him, after he gave this command, he felt his men would come. But to his surprise, they did not.
His men continued shooting out of excitement and getting shot in the process. At the end, he said he only had 5 men with him.
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