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There's a cool trick with black dragons, fire elementals, and Armageddon's Blade: first, use Armageddon's Blade, then position yourself so that the weakest units can't be attacked or retaliate! It works great!
You can also take a hero with the Resurrection specialty; you practically won't lose your army at the beginning!
Another option is to take a hero from a Castle with the Fencing or Champions specialty, and around level 10, defeat an army twice as large with a strong hero (level 4-6 higher than yours): send either Crusaders or Champions (depending on the hero) to be torn apart by them, and don't move the rest of your army (just shoot). After they die and the enemy attacks your other units, revive the fallen with Archangels, and by that time, your army will be about 1.5 times larger (of course, if the enemy is an Earth expert and has the Undead Resurrection skill, this tactic won't work :smile35:, but in other cases, the tactic is just great:smile14:).