Which of the following is the error in the sentence: "When the army realized that they had been fooled, they rush back"

Which of the following is the error in the sentence: "When the army realized that they had been fooled, they rush back"

Explanation

The verb "rush" should be in the past tense ("rushed") to match the past tense of the sentence.

Correct sentence: "When the army realized that they had been fooled, they rushed back."