1 ) Send as much of your army as possible.
* If you only send half your army, the honour gain you claim is halved. E.g. sending half your lethals and doing well against an honourable target will normally gain you 15 honour per tick rather than 30 honour per tick.
2 ) Send eta 5.
* Honour gains are reduced for smaller etas. Eta 4 sends are pretty indistinguishable from eta 5, but eta 3 and lower is pretty obvious.
3 ) Send geos.
* You are rewarded for attempts to steal land, kinda ties in with the eta 5 rule.
4 ) Send more than just one unit type.
* Mixing up the different units you send is favourable for h/f, and reduces gains from rushing pure harriers for example.
5 ) Send at targets with a greater score than your own.
* Not sure of exact numbers, but as a PoM I gain around 15 honour a tick at 70%, 30 honour a tick at 100% and around 35-40 honour a tick at 130%
6 ) Make sure your target is being defended.
* H/F is based on combined score of all the defenders present on your tick, plus 3% of the alliance score.
7 ) Make sure your target has a bounty, and is themselves dishonourable.
* Designed again as a deterrent for those with bounties that the government HQ doesn't like very much.
8 ) Win the battle!
* Kinda obvious, but if you don't win, you don't gain AS MUCH honour. You can still gain a fair bit by suiciding honourably if you fire, but not as much. This applies more to fame, but to honour as well (I think).
9 ) Defend against insurmountable odds
* If you are defending a MASSIVE incoming, and you fire first, even if you only have 10 units you will gain a massive honour boost (~40 honour).
10 ) Don't hit the same target twice within a 24 hour window.
* Otherwise, even if you succeed in all of the above fronts, you'll lose honour for repeat attacking. It's fine if on the previous occasion you recalled on attf3, but if you engaged in a tick of battle (even if no blood is drawn and nothing fires) then be sure to wait a day.
Hope that helps, I'll let you know if I think of any more. Obviously, you can apply lots of these factors into "Biggest Bounty Gains" and "Biggest Fame Gains" as well, it's all part of the "Fairness" calculator.