Firing a howitzer?

I have an old picture of my father's artillery unit. One shows a soldier about to fire the weapon and it's obvious that he is yelling something. OK, so maybe it's "Fire!" But is that what someone in the military would actually say? What is the name of the cord that is pulled to fire a... show more I have an old picture of my father's artillery unit. One shows a soldier about to fire the weapon and it's obvious that he is yelling something. OK, so maybe it's "Fire!" But is that what someone in the military would actually say?

What is the name of the cord that is pulled to fire a howitzer?

What would a soldier yell just before pulling it?
Update: Just no way to add a photo, is there?
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