Mortar (weapon) and diesel engine: what they have in common

1. Step 1. Mortar (weapon) — evolved from — Howitzer. High-angle fire.
2. Step 2. Howitzer — has part — Recoil mechanism. Recoil mechanisms.
3. Step 3. Recoil mechanism — is part of — Tank gun. Recoil mechanisms.
4. Step 4. Tank gun — is part of — Tank. A gun in a rotating turret.
5. Step 5. Tank — has part — Diesel engine. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).

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