One take on Warhammer Tactics is MSU or Multiple small units. The idea being that having multiple small units is better in many ways than having a few large units. For example having two units of 5 knights is better than having 1 of 10. You increase your fighting frontage to 10[unless you had your 10 knights wide instead of ranked] giving more attacks. You can flank units easier. you have 2 targets for your opp to deal with. You create less "meaty" targets for opp's magic or warmachines. You can engage more than one enemy at a time[if you really need to].
The key to making it work is to support your units, and get yourself into a dominant position before you engage. you shouldn't charge a large ranked unit of infantry until you can get in those flank and front charges at once.