ORIGINAL: Kronolog
If you play the artillery support card on an army, enemy units adjacent to that Army's divisions will lose fortification points, lessening the need for siege artillery.
Unless I misunderstood Cameron's answer to my bug report, that's not the case-
Hi Willgamer,
Theatre artillery isn't meant to affect cities.
There is collateral damage to the city whenever combat occurs with artillery but it's only a side effect.
If you want to reduce entrenchment levels of a city you've got to use the big guns - siege artillery.
Cheers,
Cameron
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O'K got it now (slowly re-read 4.11 and 412).
I have always associated the word siege with fortification, as in "the fort was under siege by a battery of 6 guns...".
So I had trouble understanding that in this game you siege a garrison, but reduce a fortification, both by way of the structure point mechanic but with different tools (units).
Perhaps your "too long" manual could add just a few more words?