Mortars and rockets?

[Hooahguy]

Oh man... don't me get me started. Almost EVERYONE who plays online has at least 6 of 'em in their army... it's so annoying. I'm the guy who fights a little more traditionally with more infantry and cavalry and less arty. Once you're done deploying and battle starts, a rain of a mortar shells fly in the air and land on your infantry, sometimes killing 100+. Very effective when used right. Unless you have more arty or the same amount, this FORCES you to attack and you can take many casualties while marching... I try to march as fast possible to avoid casualties, and while not tiring the troops.
... and when you get there you usually fight uphill, while light infantry take out even more of your troops while still being out of range.

"Half of our army has been killed, and we are finally in range... What are your orders Colonel?"

thats why i always keep some cavalry far out in the flanks, preferably hidden. when the enemy is all good and locked up, charge at the batteries!
people tend to leave them unprotected.