Call of Duty: Dated Warfare

Call of Duty: Dated Warfare is the only Call of Duty game taking place during World War I. It has 5 campaigns: a British, French, Canadian, Russian, and American. CoD: DW has WWI-era features like trench warfare, mortar bombardment (when you get a 5-kill streak in multiplayer), poison gas (7-kill streak in multiplayer), and British Mark IV tanks on certain maps.

Campaigns
Each campaign has 3-5 missions, and takes place on 3 different fronts over the entire duration of the war. There is also a bonus mission (unlocked when you beat the game), featuring the Battle of Tannenberg (you play as the Germans, uncommon for a Call of Duty game).

French Campaign
The French campaign has 5 missions that all take place on the Western Front. They show the Battle of the Somme and the Battle of Verdun. The enemies you fight against are German. It is the longest, and first, campaign in the game. The first 3 missions deal with the French victory at Verdun. You play as Lt. Ferdinand Mouquet, whos family was killed by a poison gas attack. The last 2 missions take place in the Battle of the Somme. You play as Pvt. Joseph LaRoche.
 * Mission 1: We Shall Get Them! - The failed attempt to recapture Ft. Douaumont; Mouquet must help rescue his comrades.
 * Mission 2: They Shall Not Pass - Helping the defense of the city of Verdun.
 * Mission 3: Total War - The recapture of Ft. Douaumont.
 * Mission 4: Zero Hour - Shows Laroche's actions on the first day of the Somme. His battalion rescues British troops from a German ambush.
 * Mission 5: Vive la France! - French soldiers drive the Germans out of the area. This mission shows the happiness behind a minimal victory; because the fighting is thankfully over.

Russian Campaign
The Russian campaign is set on the Eastern Front. The 4 missions include the Brusilov Offensive, Second Battle of the Masurian Lakes, and the Great Retreat. You fight against a mixture of German and Austro-Hungarian forces. The first mission takes place during the ending phase of the Brusilov Offensive. You start off playing as Sgt. Antonin Kalmakov. The next 2 missions are flashbacks that deal with the 2nd Battle of Masurian Lakes. You play as Captain Ilya Dardanin. Sgt. Kalmakov is your squad mate. The last mission is set during the Great Retreat out of Galicia/Poland. You again play as Kalmakov; still alive but barely.
 * Mission 1: Halting the Attack - The taking of Lutsk.
 * Mission 2: Winter Horrorland - Russian forces barely survive a German attack during a snow blizzard.
 * Mission 3: Watery Grave - Dardanin dies as his regiment gets surrounded.
 * Mission 4: The Tsar, The Supreme Commander - Kalmakov and his comrades flee as the Germans advance. This is mostly a cinematic mission portraying the Russian failure in Galicia and its aftermath.

British/Australian Campaign
The British/Australian campaign is on the Middle Eastern Front. It has 4 missions, all that deal with the Gallipoli Campaign. The first 3 missions are set during the Battle of Gallipoli. You start off playing as Pvt. John Birdwood of Australia.
 * Mission 1: Hard Landing - Your regiment has a tough time landing at ANZAC Cove.
 * Mission 2: No Swift Victory - You play as Major Edward Staunson of the Royal Army. This mission deals with the Battle of Gully Ravine.
 * Mission 3: Turkish Delight - You again take the role of Pvt. Birdwood. You assault the Turkish trenches at the Battle of Lone Pine.
 * Mission 4: Holiday in the Dardanelles - Back as Major Staunson, you take part in the failure at Hill 60 and the Allied evacuation.

American Campaign
With 3 missions, the American campaign happens during the Hundred Days Offensive. The first mission takes place in the Battle of Amiens. You play as 2nd Lt. Nicholas Rogers, who's a stereotypical U.S. "Doughboy". The other 2 missions both take place during the Meuse-Argonne Offensive
 * Mission 1: Blindfire - In dense fog, American forces cross the river to attack a German encampment.
 * Mission 2: Doughboys in Europe - Running out of food and supplies, 2nd Lt. Rogers and his battalion strike a German artillery camp with their last remaining tank.
 * Mission 3: Not Out of the Woods Yet - 2nd Lt. Rogers advances quickly towards the Meuse.

Canadian Campaign
The shortest campaign in the game (2 missions), the Canadian one features the Battle of Vimy Ridge and Battle of Passchendaele. You play as Staff Sgt. Lewis Crane, who is seen in the British campaign. The first mission takes place during the Battle of Vimy Ridge. The second, and last, mission is set during the Second Battle of Passchendaele.
 * Mission 1: Mortar Rain - After an artillery strike, Crane's regiment assault the German trenches.
 * Mission 2: Mud Fields of Hell - Sgt. Crane drives a Mark IV into the German lines.

Weapons
The country in brackets is the country of origin. Users for each gun vary. For example, French military uses some British weapons.

Pistols

 * Webley Mark VI Revolver (British)
 * M1911 Pistol (American)
 * Mauser C96 (German)
 * Luger PO8 (German)
 * Nagant M1895 (Russian)

Rifles

 * Lee-Enfield (British)
 * Martini-Henry (British)
 * Lee-Metford (British)
 * M1903 Springfield (American)
 * M1918 BAR (American)
 * Ross rifle (Canadian, available during British campaign as well)
 * Gewehr 98 (German)
 * Gewehr 1888 (German)
 * Mosin-Nagant (Russian)
 * Lebel Model 1886 (French)
 * Berthier rifle (French)

Machine Guns
Except for the Chauchat and MP18, these are all mounted.
 * Lewis Gun (British)
 * Vickers Gun (British)
 * M1895 Colt-Browning (American)
 * Chauchat (French)
 * Hotchkiss M1914 (French)
 * Hotchkiss M1909 Benet-Mercie (French)
 * MG08 (German)
 * MP18 (German)

Explosives

 * No 1 Grenade (British)
 * Model 24 Grenade (German)

Miscelleanous

 * Kleinflammenwerfer (German, flamethrower)


 * Winchester Model 1897 (American, shotgun)


 * M7 Grenade Launcher (American, rifle grenade)

Features
The game has several WWI-era features. One was killstreaks, of which there are 3. There are also Britsh Mark IV tanks in 2 missions. Trench warfare is an integral part of gameplay. The war's terrible conditions and casualties are reflected in the game's art style and cutscenes. Also seen is the desperaty for victory by each army.
 * 3 killstreak - Zeppelin recon
 * 5 killstreak - Mortar bombardment
 * 7 killstreak - Poison gas attack