This depends entirely on the map your on. Generally, for small maps you want to focus on your army and destroying your opponent's miners and stop their income of gold.
Castle:
Personally, I like to use Archer/Sword and kiting against other Swords. If they spawn a Spearton, spam Swords. You only need 3 Swords and 1 Archer.
Ice World, Desert, Swamp Lands, and any other medium sized-maps:
This generally depends on the type of strategy you are used to. You can turtle, it works, or you can attack and play the offensive. Personally, I like to play the offensive. Spearton Rush works here, not too well, but well enough against opponents 1500 or under. Sword/Archer works, 2 Swords work, 1 Sword works, but the thing you DON'T want to do is make 3 more miners. You'll have no defense, and a Spearton will crush you as the Castle Archer doesn't do much against it.
Grass Hills:
This is one of the toughest maps. Here, you want to focus on your economy, or attack, whichever you prefer. But be warned, if your opponent makes 3 miners and you don't go check, you'll be at a HUGE disadvantage. The Spearton thing doesn't work very well here, as your opponent will have enough time to make 4 Swords. DON'T DO SWORD/ARCHER NO MATTER WHAT. Make 1 Sword or 2, or turtle, do anything you want. Personally, I still play the offensive, but turtling with Walls and Castle Archers does work very well on this map.
Great starting strategies but i consider:
Castle, Halloween, and Swamp Lands as small maps
Forest, gates, Ice World, and Desert, any other as medium map
and grass hills, large map
