You assemble army/ies from 20 strongest creatures, put one to defense and then attack with all of them. How many armies will you build is up to you. To attack with your army you need Galleons and you are getting 2 each day. But galleons can be bought or better someone can buy them for you (lower players can help a lot with sending them out). Also armies can be relieved to attack again the same day.
Buying galleon yourself is for 45D
Buying galleons from your guild mates is for 15D, 20D and then 25D for each.
Relieving your army is for 50D, 50D and then for +50D each
Daily you can get 70D (from Ads) + 12D (from Daily Quests) + 40D (max for logged in guild members) + ? (from Quests or Summoning or ..from shop.)
Assembling Army
* Each army is composed from 20 units, no less.
* Bonuses exist for "Same Color", "Same Size", Max Combo Dots and Enchants.
* Max Combo Dots means just 4D.
* Enchants require all 4 enchants to be used. And, as above, even one creature with no enchant or with lower enchant remove the bonus.
* Bonuses start from 25% and up, therefore army composed from 20 Leg will have almost double the bonus in comparison with army having 19 Leg and one Epic. The difference is huge.
* All armies suffer from 24h cooldown, which you can relieve for 50D and then yet again for 50D more an so on (50,50,100,150,200..
* In the end if you have surplus of Galleons you should assemble smaller armies to use them all. Galleons are now properly reseted between GW
Defend
* You can place to defend only one army, choose wisely! To place your army tick the defend and add it into the building. The army cannot be moved out by your after some time, so you will need to ask Officiers or Leader(s). Even they can do it only in the preparation phase before the GW starts.
* Calculated power is the one which you have at the moment when you place your army to defend. You can upgrade army continually, but it will not be reflected for defense, only for your attacks.
* Defending army cannot be rearranged during GW!
* Swarm forts according your powers. Legendary Fort is the second most important here, then Epic, and then Color shrines populate one by one to man them completely, as a last goes Medium and naturally you should have no one left for a Small fort. (Because you have Castle+Leg+Epic+B+W+R+G+BLU+Y+Rare+small, ie 11x4

Forts
* Castle Fort it's the most important to defend as it generates most Prestige per Hour. Higher level = higher PPH and also higher defense.
* After any Fort upgrade, which can be done only by Officiers and up, follows cooldown. Later these are hours..
Attack
* To attack with army you need a Galleon. By default you are getting two in a day, above that you can buy more yourself, starting from 45D and up by +5D or getting one by your teammates, which cost them only 15D, 20D and then 25D for each.
* Share the galleons as much as you can, you will see how where you need to send them or ask, or someone ask you.
* Spy on your enemy, see when they are weak and attack for max reward. Or don't bother, just pick him and torn them down by manifesting your sheer power. Aka to be Spy or General.
* Go for buildings with highest level but weak defense, to deal most damage and get the most shards
* Or for buildings with higher than lvl 1 being before collapse, for blow bonus.
(Though mind that you will see the real HP only after you attack them, and high level building may have quite a lot of HP left even being in red.)
* Destroyed building lost one level, minimal level is 1.
Tactic
Galleons and Targets should be arranged via chat. Chat window is now integrated within Guild Wars, autorefresh and omits other notifications.
Shop
Visit shop to claim your reward, you may like Color Leg Idols or just Essences, also Sigils, Elementalist' Formulas and practically all resources just for a buck. Yes, yes - Ankhs and Prismatic Orbs too.

Log
See for overall Guild's stats. Killing blow is always for destroyed structure. Additional bonus is very pleasant.
Bugs
* HP are not updated during your fight or session, you need to go out and back to see updated values.