The Call to Arms content was part of the Europa Universalis IV sign-up campaign held before launch, and since we have had requests from people who would like to experience the content we decided to offer it up to those who want in on the action.

Europa Universalis IV: Call to Arms Pack includes:

Europa Universalis IV: The Winged Hussars Pack
Europa Universalis IV: Winged Hussars Unit Pack contains 12 unique cavalry models for the cavalry for Russia, Poland and Lithuania, three of the most influential eastern European states in the Europa Universalis IV era.

Europa Universalis IV: The National Monuments Pack
Europa Universalis IV: National Monuments adds new graphical national monuments to the already stunning Europa Universalis IV map. The new map items are: The Cologne Cathedral, The Notre Dame cathedral, The Tower of London, The Old Faithful geyser, The Kremlin, Saint Peters Cathedral, Mount Fuji and the temple Angkor Wat.