Yes, you are correct. "Was used" and "was entered" are both verbs in the sentence. "Was used" is in the past tense passive form, indicating that the subject (the Superblade) was the object of the action (being used). "Was entered" is also in the past tense passive form, indicating that the subject (the anterior chamber) was the object of the action (being entered). Verbs are words that express actions, occurrences, or states of being.
