Tips from the Frontline

[kineas]

Playing a QB attack

"Attack tactics are basic in the extreme - the attacker must simply roll forward until something shoots at him, they he must stop and blow it away. He then continues rolling forwards and repeats the process when something else shoots at him, and so on, in a series of rolls and stops down the map. An attack can therefore be summed up as - roll-stop-shoot/ roll-stop-shoot/ roll-stop-shoot

A more elaborated version can be found here

20 minutes is very,very short time for an attack on a map like that. More like 35+.
It will take 10-15 turns for you to get near the flags.