Gurrella Warfare is a spanish term. The word Gurrella originally means 'Little War'. This speaks to me of using the same tactics that won USA it's independence. The British troops marched out, all nice and pretty in their formations. The Americans started sniping anyone with a funny hat from the treelines. Mind you, they learned it from the Native Americans during the French/Indian war, who developed it independantly from Spain who invented it to keep people out of their land.

The other thing could be the old saying 'Defeat in Detail'. Force your opponent to split his troops until they break down into managable sized chunks for you to take down, one at a time.

A Shakespearean Sonnet he may want to remember, though...

The painful warrior famoused for fight,
After a thousand victories once foiled,
Is from the book of honour razed quite,
And all the rest forgot for which he toiled