[3] The film was directed by Roni Ezra, and the screenplay was by Tobias Lindholm (who also wrote A Hijacking, Borgen, and The Hunt).

The outline story was based on eyewitness accounts, conversations, and interviews with the few surviving veterans of 9 April 1940, who fought the invading German Army.

[4] The Mellem Slesvigs Grænser museum in Bylderup-Bov was approached by Nordisk Film in the autumn of 2013 with regards to assisting with uniforms and weapons.

In March 2014, the film company collected 120 Danish steel helmets, 100 gas-mask canisters, 50 pairs of wool pants, 24 dummy-rifles, 32 cartridge belts, and a khaki officer coat.

The film received mixed, but generally favorable reviews from Danish critics, with Berlingske and Ekko giving it 5 out of 6 stars,[7][8] while others gave it between 2 and 5 out of 6.