Trebuchet

Mideval sling type construction used to throw Rocks and dead (contaminated) cattle over the enemy defence.

Imagine a tripod with a long arm attached to the top of the tripod. The arm should rotate over the top. The arm should have a counter weight on the short side and a hook on the long end. And it should rotate free until the long arm is vertically up.

Functioning

Pull the rope you have attached on the long end. The hook will come down so you can attach your ammunition. This happens on the rear side of the trebuchet. Aim the device carefully not to hit innocent bystanders. Release the rope and off you go.

I could not withstand. It looks more (IE) or less (text browser) like this:

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Traveller in Time on his head