Activate the following cheats by entering the corresponding codes. Note: The codes may only be enabled in the unpatched version of the game.

CHEAT FUNCTION - CHEAT CODE
Full map - .matteosartori or .daggins
Unlimited KoKu - .muchkoku.
Unlimited army life - .prototypearmy.
All provinces have copper - .ifoundsomecu.
No construction abilities, negative KoKu, can start new game as Clan Hojo - .conan.
Can build armories in any province on next turn - .viagra.
Get gold - .mefoundsomeau.
Get silver - .mefoundsomeag.
Get copper - .mefoundsomecu.
Kill any person without dying - .spylookahead.
Faster unit and building construction - .booyakasha.

The Yari Ashigaru is just a collection of poorly armed and thinly protected peasant warriors. They will usually run from battle when confronted by a superior enemy. The Yari Ashigaru should be positioned along the flanks, out of harm's way, or stationed towards the rear to protect ranged combat units.

Make an alliance with the Portuguese traders when they make landfall. Their arrival will allow you obtain guns for your forces and eventually build powerful gun factories.

Spy on prospective enemies before attacking them, then send a spy or emissary into an enemy-occupied territory to determine their overall strength.

In scenarios where the only objective is to take out enemy leaders, the objective can be completed by flooding the enemy's home territory with dozens of untrained ninjas then ordering them all to attack the enemy Daimyo. They will have about a 10% chance of success.