Most likely means an engine that has not been worked on or touched with any new parts, probably remains in it's original condition.

They were demanding freedom for the black slaves.

Go for the civilian underpinning of the Confederacy.

Show that you can march anywhere in the South, unmolested.

Bring it home to the farmers and the families. Make them howl for surrender.

They lost the terrain but the British suffered much heavier losses. On top of that, General Howe failed to follow up and pursue the retreating colonials, allowing to fall back unmolested.

Unmolested wasps, treated with respect, generally do not sting as stinging is purely a defence reaction. Apart from that, the biggest group of stingless wasps are the solitary wasps - hundreds, probably thousands of species.