Ultimate Defense:
Note1: special and super weapons may still hit your base. 
Note 2: there are other ways to defend your base, i just think this is the best 
one ;) 

USA: build 3-4 fire bases at each entrance to your base. then put three missile 
guys and a sniper in each. put 2 avengers behind each base, and keep a 
tomahawk around to deal with artillery. 

China: build bunkers at each entrace(build more than 2) and fill them with 2 Red 
Guard and 3 rocket guys. then keep a nuke cannon around to take out enemy 
artillery. 

GLA: build a solid wall of stingers around your base, and put a tunnel network 
somwhere so you can get in and out of you base. keep a rocket buggy or scud 
aroud to deal with artilery.

Unlimited Money:
First you have to find your "Command and Conquer Generals Zero Hour Data" 
folder. It is probably under My Documents. Once you open the folder, look for the 
file called "Skirmish" (NOTE: the file is NOT called SkirmishStats). Once you open 
the file, look for the section labeled "StartingCash". When you see that section, 
you can enter in any number, no matter how big or small, it will work. When you 
start the game and go to the skirmish setup menu, the starting cash section will 
NOT say how much you typed in. But wait once you start the game, the cash will 
be there.

Save room in Tunnel Network:
If you are the GLA and if you can make a Battle Bus, make eight and fill them all 
up with Rocket Soldiers (or something you like). then take the eight filled Battle 
Busses and put them into a Tunnel Network, that way you can put 64 soldiers in 
one Tunnel Network.

Dr. Thrax: Perfect attack force: 
As GLA Dr. Thrax, upgrade to Anthrax Gamma. After that, you will need four 
Battle Buses. Fill two of them with Toxin Rebels and the other two with RPG 
Troopers. This force will be very difficult to defeat because the Toxin Rebel buses 
will destroy all infantry in range, while the RPG troopers will destroy every tank, 
aircraft, and even most buildings very easily. Also, they can attack from behind 
and in front at the same time.

U.S.: Ultimate killing force: 
Get six Humvees with TOW missiles and the Repair Droid. Load them up with two 
Snipers and three Rocket Soldiers. Use your Particle Cannon to knock out the 
enemies defenses then wreak havoc on the rest of the base.

U.S.: Defenses:
Line an area with a sequence of Patriot, then Firestorm Base, Patriot, and keep 
going. Then fill the Firestorm Bases with four Pathfinders. This will help you take 
out infantry without trouble of Flashbangs or other hazards.

Chinese: Ultimate force:
Create six Emperors or Overlords, depending on the General you are playing as. 
If you are using Overlords, upgrade two with Bunkers and fill them with Tank 
Hunters, upgrade two with Propaganda Towers, and two with Gattling Cannons. 

Easy skirmish mode wins:
Play as the U.S. laser general against the Chinese infantry general. This also 
works well on the eight-player maps. Sit up so that every man is for himself. On 
the hard level, the infantry general sends waves of soldiers who are easily mowed 
down by the laser turrets. Be quick to obtain the particle cannon so that you can 
knock out the nuclear missiles.

Battle awards:
Accomplish the following tasks during a campaign or skirmis to earn the 
corresponding award. 

Air Wing Honor: Build over 20 aircraft against the CPU. 
Apocalypse Honor: Build the Particle Cannon, Nuclear Missile, and Scud Storm. 
Battle Tank Honor: Build over 50 tanks against the CPU. 
Blitz Honor: Win a match in less than five or ten minutes. 
Challenge Campaign Honor: Complete the Generals Challenge Campaign. Bronze, 
Silver, or Gold depends on difficulty. 
China Campaign Honor: Complete the China Campaign. Bronze, Silver, or Gold 
depends on difficulty. 
Domination Honor: Win 100, 500, 1000, or 10,000 total matches 
Endurance Honor: Complete all skirmish maps against the CPU. Bronze, Silver, or 
Gold depends on difficulty. 
Fair Play Honor: Do not disconnect more than 10% of your online matches. 
GLA Campaign Honor: Complete the GLA Campaign. Bronze, Silver, or Gold 
depends on difficulty. 
Global General Honor: Win at least one online match as each General. 
Streak Honor: Win 3, 10, 25, 100, 500, or 1,000 consecutive victories. 
Ultimate Honor: Complete all Skirmish maps against the maximum number of 
enemies under the hard difficulty setting. 
USA Campaign Honor: Complete the USA Campaign. Bronze, Silver, or Gold 
depends on difficulty.