🚀 go-pugleaf

For the defend Keanor battle, its ridiculously easy, if your quick.
Step 1 is build a harbor, and a lumber mill and research woodcutting. Build 2 fishing ships, then alternate between a peasant and a ship as food comes in faster than wood. You want at least 4-5 fishing ships, each to its own school of fish. 

The best tactic to taking out the red base fast, is Knight rush. You want to get knights as fast as possible. I usually have 4-5 knights by the time the first footman comes into range, if your wondering where you should be time wise.

Step 2- blacksmith and stable + learning, don't get tempering or armor until after plate armor. Time is of the essence, as soon as you have gold enough, get plate armor, learning, 4 knights, scale armor, tempered blades. The knights should be training as soon as you have gold enough to stack em in the barracks. 

Step 3- Ghiron training is optional, but as soon as you have 5-6 knights, kill your way up to the bridge, since the first footman signals the reds are pushing for you. By the time I had the bridge settled with 6 or so, 6-10 more would be ready, once I had a dozen or more I would send them after the towers.
NOTE- IGNORE enemy units, and put at least 6 knights to a tower, knights can wreck towers en masse. You can use one or two knights to kill units as the others break the towers. 
You will lose knights, but you should have more training during the assault, with the rally point on the bridge for closer grabbing, if not in the enemy camp. You should breach the camp during or just before they build their first seige workshop.  

With 20-25 knights, the red base should die before the dawn of the second day. This starts a trigger for the Keanor units to move out to the 'spawn' points of the purple army. You may need an archer or longbowman to clear the north side and ferret all the red buildings just in case. Because this helps Keanor units 'mobilize' for the coming assault once the last red unit and building dies or is converted.

Step 4-Now, set all the peasants working gold, onto stone and wood, and get more on wood. Your going to need a lot of both to wreck the purple army. Food is not a priority, so the fishing ships should be fine for keeping up with your needs. The purpose is to abuse a certain tower.

Step 5- Build a seige workshop, and get the seige tower upgrade. Then for the next day, build at least 15-20 towers north of the north gate, spread out a bit, you want them to be able to cover one another and 'pen' the enemy in. Walls are optional. 
Do the same at the western extreme of the map at the road there, where other purple units spawn in.

Step 6- The southern group is crafty, they appear on and to either side of the road, in the middle of the space between the castle gate on the south, and the southern border of the map. So the towers here need to be set around there.

Finish- The towers will get smashed to be sure, I lost at least half in each area. But the first units destroyed in each area were the seige engines, might have been good luck on my part, except on the west side. So some knights or other units set in that area for precision targeting can help, if not manually setting towers to attack them. The towers soften the enemy up by A LOT, and being seige towers, that's splash damage, and with them spawned in nice dense numbers, its a near rout. By the time the towers are getting well an truly smashed, the Keanor untis begin their march out, and mop up whats left.

Hints- The knights make fast units, and great tanks. 5-6 of them can, and will break a tower with little difficulty, unless it is a seige tower. But even then, 7-8 make up the difference. And this is before armor and attack buffs. This offsets the need of ballista or catapults if the towers are spaced like the red base has them. And saves the wood for seige towers against the purple.

Second note- Finish any towers you can before dawn of the day of the attack, any still in the process of upgrading when the trigger for the purple arm