Nevskij's cantata

[Giampaolo Gandolfo]

    In Aleksandr Nevskij's cantata (Prokof'ev) the invading crusaders sing a song in Latin, where two lines don't make sense to me:

    Peregrinus expectavi
    pedes meos in cimbalis
    Vincant arma crucifera!
    Hostis pereat!
    
What is the meaning of the first two lines? They dont make any sense to me, neither grammatically nor logically; and how do they relate to the first two?
    Any idea? Thank you.
            Giampaolo Gandolfo
             

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