A French military decoration for bravery in combat.
http://www.thefreedictionary.com/Croix de Guerre
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The Croix de Guerre (English translation: Cross of War) is a military decoration of France. It was first created in 1915 and consists of a square-cross medal on two crossed swords, hanging from a ribbon with various degree pins. The decoration was awarded during World War I, again in World War II, and in other conflicts. The Croix de guerre was also commonly bestowed on foreign military forces allied to France.
The Croix de guerre may either be awarded as an individual or unit award to those soldiers who distinguish themselves by acts of heroism involving combat with the enemy.
https://en.wikipedia.org/wiki/Croix_de_Guerre
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Note added at 2 hrs (2016-01-03 18:55:49 GMT)
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Ten krzyż jest przyznany dla ochotników

Croix du combattant volontaire
The Croix du combattant volontaire (Volunteer combatant cross) may refer to one of three French military decorations rewarding soldiers who spontaneously chose to serve with a fighting unit.

Croix du combattant volontaire 1914–1918 (Combatant Volunteer Cross 1914–1918) recognizes those who have volunteered to serve on the front in a combat unit during World War I.
Croix du combattant volontaire 1939–1945 (Combatant Volunteer Cross 1939–1945) recognizes those who have volunteered to serve in a combat unit during World War II.
Croix du combattant volontaire de la Résistance (Combatant Volunteer Cross of the Resistance) recognizes those who fought in one of the resistance groups, or have been deported or interned for acts of the Resistance, or have been killed or injured in acts of resistance during World War II.
https://en.wikipedia.org/wiki/Croix_du_combattant_volontaire

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Note added at 3 hrs (2016-01-03 19:03:16 GMT)
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Krzyż dla wojowników

Croix du Combattant
Translation: Cross for Combatants

The "Croix du Combattant" (Warrior’s Cross) was instituted June 28th, 1930 as an addition to the "Carte du Combattant" which was instituted December 19th, 1926. The reason was to recognize those who had fought for France during World War One. On institution, it was decided to award the Cross to veterans of the wars of 1870-1871 and 1941-1948 and to those who had taken part in the colonial wars in between.
Janaury 29th, 1948 it was decided the Cross could also be awarded to veterans of World War Two and on July 18th, 1952, this was extended to veterans of the Indo-China and Korean wars.
http://en.ww2awards.com/award/2267