The basic idea is to keep your gold units alive while consuming trash/low gold units (halbs/ewoads). Some combo like halb + SOnager + bcs/trebs should do great vs paladin civs. If you are vs Mayans/aztecs, you need champs/ewoads/esams as guard for onagers, instead of halbs (common sense). If you are Mongols, make sure you keep your mangudai alive till you have room to move around, and then they kick ass.