Ok, so its not exactly tomorrow, but school is rough, rats are difficult, and no one seems to use this forum.
Rats are the most interesting group in Brian Jacques' universe of Redwall. This is because although they are often in positions of authority, they form the majority of the troops among vermin armies and can even be occasionally good, they have no special skill or group identity.
They also use almost every weapon known to man in the medieval ages. Spears, javelins, slings, bows, swords, cutlasses, pikes, etc...
There are a few types of rat however which can be identified.
Sea Rats: The rats who rule the seas, most likely to be leaders, ever, most likely to use bows, most vicious, most feared, best organized.
Tribal Rats: feral rats, fewer of them than other feral species, painted. In specific 'The Painted Ones' who are seen in many books. Use blowpipes, blunt branches and short spears.
Common Rats: The soldiers, use spears mostly, also use slings. Come in large numbers, usually never amount to positions of authority. Can produce archer rats as well, of a sneakier, more pathfinder kind.
Thoughts:
Rat Recruit (Actually applicable here): Common Rat or Tribal Rat
Common Rat: Water Rat or Regular Rat
Tribal Rat: Painted one
Water Rat: Bilge Rat or Sea Rat
Regular Rat: Rat Scout or Rat Soldier
Sea Rat: Corsair Rat or Corsair Skirmisher
Corsair Skirmisher: Corsair Archer
Corsair Rat: Trident Rat
Rat Scout: Rat Archer or Rat Slinger
Rat Soldier: Spear Rat
Rat Recruit: Dagger
Common Rat: short spear
Tribal Rat: Blunt stick
Painted One: Blowpipe and short spear
Water Rat: short Spear
Bilge Rat: pike
Sea Rat: cutlass or axe or short spear
Corsair Rat: cutlass, optional shield
Trident Rat: two-handed trident
Corsair Skirmisher: javelins and cutlass
Corsair Archer: bow and cutlass
Rat Scout: short sword or spear, sometimes javelins
Rat Archer: bow and sword or spear
Rat Slinger: sling and sword or spear
Rat Soldier: sword, sometimes shield
Spear Rat: spear and sometimes shield