Some Fortress War items found from the korean site:
Buffs:
Name: Flag of Battle
Duration: 1 hour
Use: Inside radius(10m) 24 people max are given +10% phy/mag attack
Purchased from: Assistant junior official
Name: Flag of Defense
Duration: 1 hour
Use: Inside radius(10m) 24 people max are given +10% mag/phy defense
Purchased from: Assistant junior official
Name: Flag of Healing
Duration: 1 hour
Use: Inside radius(10m) 24 people max are given +5% hp/mp every 5 second
Purchased from: Assistant junior official
Attack Items:
Name: Fortress Hammer
Duration: 1 hour
Use: Destroy the castle's infrastructure
Purchased from: Assistant junior official inside village
The hammer
Name: Fortress Axe
Duration: ?
Use: Destroy the castle's infrastructure, more powerful than Hammer
Purchased from: General Market inside Fortress
Name: Vibrating Bomb
Use: Kind of Frag Grenade
Purchased from: ?
Defense Items:
Name: Small Repair Kit
Use: Repairs the infrastructure
Purchased from: ?
Name: Medium Repair Kit
Use: Repairs the infrastructure
Purchased from: ?
Name: Large Repair Kit
Use: Repairs the infrastructure
Purchased from: ?
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Guards:
Name: Chinese Fighter Warrant
Use: Chinese NPC fighter which will protect the city for the ruling party.
Purchased from: Fortress Undergarment Battle Assistant.
the Guards - Credit to key-J for finding the pic
Name: Chinese Bowman Warrant
Use: Chinese NPC bowman which will protect the city for the ruling party.
Purchased from: Fortress Undergarment Battle Assistant.
Name: Islam Fighter Warrant
Use: Islam NPC fighter which will protect the city for the ruling party.
Purchased from: Fortress Undergarment Battle Assistant.
Name: Islam Chakram (kind of weap) Warrant
Use: Islam NPC fighter which will protect the city for the ruling party.
Purchased from: Fortress Undergarment Battle Assistant.
Name: European Fighter Warrant
Use: European NPC fighter which will protect the city for the ruling party.
Purchased from: Fortress Undergarment Battle Assistant.
Name: European (three palace) Warrant
Use: European NPC fighter which will protect the city for the ruling party.
Purchased from: Fortress Undergarment Battle Assistant.
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Monster Items:
Name: The Golden Petal
Use: A scroll to summon a trainable monster, with enough training it can become lethal.
Name: The Silver Petal
Use: A scroll to summon a trainable monster, with enough training it can become lethal. (prob less powerfull than golden scroll)
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Transport Items:
Name: Darkness Ryong
Use: Transport
Name: Cloth Horse
Use: Transport
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Other Items:
Name: Command Quarters Operation Manual
Use: This will summon the Assistant junior official needed to purchase certain items.
Name: Obstacle Operation Manual
Use: Creates obstacles for the enemies.