Codex Battlezone: Cityfight is an expansion codex book for Warhammer 40,000 3rd Edition. This codex covers battles in urban terrain with special rules, army list updates, equipment for fighting in cities, terrain modeling, campaign design and scenarios.
From the back cover:
Throughout the universe, warring races descend on each other's cities bringing destruction with them. In the shattered ruins, old generals are forced to learn new tricks while their soldiers hope merely to survive. Inside you will find:
Cityfight core rules explaining how to fight battles in urban terrain.
Codex modifications needed to amend army organization for Cityfight.
New equipment for attackers and defenders.
The Battle for Vogen. Background details for a famous cityfight in the Cadian Gate.
Cityscaping. Instructions on how to make your own buildings and assemble a Cityfight battlezone.
Gaming ideas. Advice on how to play campaign to decide the fate of a city.