Soldiers vs Zombies is an amazing server created by Dim3000 who has not been on the server for ages...
Thanks to ogie and ep1c to keep it going and ogie for writing this...
This is how you play the game:

Zombie: Your job is to infect/kill all the soldiers. You are well armored and
regenerate health over time.
Your only weapon is your "Zombie Pickaxe" which you can use to attack the soldiers
and break their defences (Wooden Fences). If you die, you become a Ghost.

Soldier: You must survive the zombie onslaught! You are armed with Swords and Bows but have low armor and don't regain health much so watch out. In addition you get a single HEALTH potion so use it wisely! You can also place defences (Wooden Fences) to assist you. If a zombie kills you, you become a zombie as well, but a natural death results in you becoming a Ghost.

Ghost: Welcome to the Ghost Realm. You can't attack or be attacked by anyone but can cause mischief. You get Flint+Steel which you can use to relight the Netherrack under unsuspecting players. Also don't forget that you can try to block or push players.

game is over when you infect the soldiers/kill the zombies...

Yes there is a texture pack just for the server so thanks to Wulf_Oman so if he comes on while you are say Thanks...... Here is the link: http://www.planetminecraft.com/texture_pack/soldiers-vs-zombies-customized-pack/