alright, i have the best technology and i try building the army (combination of 3 units) of tank, mustang, artillery, B17 what got you) and I can NEVER defeat the bloody Rifleman in the enemy city!!!!!! I keep losing all my units and i am really at my wit's end. any idea what is wrong??? is it some bug??
maybe it's a dumb question, but you aren't actually trying to form an army of 3 different unit types to make an army, are you?? You need to have three tanks to form an army, 3 fighters (which aren't that strong, bombers can take down riflmen, not usually fighters), and 3 artillery to form an artillery army.
A tank army will usually beat riflemen armies, but it can be 50/50 odds. Artillery armies should beat the riflmen armies, but if the art army is non-vet and the riflemen army is vet w/ upgrades, I can see it winning.
naval support is useful, as is overwhelming them w/ lots of armies (unless you're facing the Aztecs, who auto-heal). Getting a barracks shouldn't be difficult in the modern era, and should be used to make your units vet. Otherwise, go for bombers.
If you are playing on Warlord like you said, then you should actually be getting a little boost to your attack as well, +50%, so you shouldn't be having problems.
Either you are not actually forming armies, or you are not sending enough armies their way.
If you are still having problems, post them specifics of what you are trying to beat and we'll help you take 'em down.