时间线

* 德国于2月21日发动凡尔登攻势，企图夺取默兹高地的防御阵地，以迫使协约国发动全面攻击，德国希望这将耗尽法国和英国军队的人力。战斗拖延到12月，德国推进的所有阵地都又丢掉了，并且也没有预想中的协约国全面进攻。
* 德国于3月9日对葡萄牙宣战，导致葡萄牙加入协约国。
* 日德兰海战于5月31日开始，于次日结束。英国海军遭受的损失更大，但成功迫使德国海军在战争的剩余时间里只能龟缩在港口。
* 俄国于6月4日发动布鲁西洛夫攻势，并于9月20日结束，俄国取得了重大进展，但伤亡人数极高。它未能达成使奥匈帝国退出战争的目标。
* 索姆河攻势于7月1日开始，并于11月18日结束。此役没有明确的胜利者，尽管协约国往德国战线里推进10公里，但他们未能达成预订目标，并遭受了60多万人的伤亡。
* 布鲁西洛夫攻势促使罗马尼亚于8月27日通过入侵特兰西瓦尼亚参战。 然而，德国的干预导致罗马尼亚军队于12月崩溃，并导致布加勒斯特被占领。

### 1917年

* 二月革命于3月8日（旧历2月23日）在俄国爆发，导致沙皇尼古拉二世退位。临时政府由亚历山大·克伦斯基建立，俄罗斯成为共和国。临时政府和苏维埃（工人委员会）之间建立了二元政权。
* 在1月份截获齐默尔曼电报和2月1日德国恢复无限制潜艇战之后，美利坚合众国于4月6日对德国宣战，从而参加世界大战。他们于同年12月7日向奥匈帝国宣战。
* 希腊于6月29日向中央同盟宣战。
* 帕斯尚尔战役于7月31日开始，于11月10日结束，造成大规模伤亡，双方都没有任何重大进展。
* 卡波雷托战役于10月24日开始，于11月19日结束，中央同盟取得重大胜利，意大利第二军完全崩溃。
* 十月革命推翻了俄国临时政府，导致了苏维埃俄国的建立和二元政权的终结，以及俄国内战的开始。俄国实际上不再是大战中的参战方。

### 1918年

* 伍德罗·威尔逊，美利坚合众国的总统，于1月8日提出了他的十四点和平方案。
* 德国于3月21日在法国发起了春季攻势，取得了重大进展，但没有补给来维持它。由于补给和力量都不足，德军在7月至8月间再次在马恩河被决定性地击败，协约国的反攻得到了坦克的支援。
* 现在得到美军支援的协约国于8月8日发动了百日攻势，导致德国军队彻底崩溃并夺取了兴登堡线。
* 意大利随后于10月24日发动维托里奥威尼托攻势，导致奥匈帝国军队崩溃。
* 11月3日奥匈帝国签署了与协约国的停战协定，而德意志帝国于11月11日签署了停战协定。大战以协约国的胜利而告终。

### 1918年

* 奥地利的查尔斯一世 放弃了权力,但是没有官方退位. 奥地利宣布11月12日成为一个共和国.
* 英国, 法国和意大利11月12日武力占领了君士坦丁堡
* 捷克斯洛伐克 和匈牙利 宣布从 奥地利,中独立，当 Poland 从德国控制的波兰王国宣告独立的时候。
* 拉脱维亚11月18日宣告从俄罗斯中独立, 成为了最后宣布独立的波罗的海国家。这件事在东面尽管战争结束的德国支持下完成,
* 临时黑山政府known as the Podgorica Assembly dethrones the exiled King Nicholas I, and declares a union with Serbia on 26 November. Serbia annexes Montenegro officially on 29 November. This move is opposed by Montenegrin nationalists, as well as Italy.
* 爱沙尼亚独立战争开始于11月28 日布尔什 维克红 军涌入之后. 爱沙尼亚公民同时加入了布尔什维克红军和爱沙尼亚军队.
* The Greater Poland Uprising begins on 27 December as Poles in German territory fight to join the fledgling Polish Republic.
* *The USPD representatives in the Council of the People's Deputies remain in government despite aggression from the SPD against revolutionary soldiers. The USPD is able to maintain leverage over the reformists of the SPD under Friedrich Ebert. The USPD representatives demand parliamentary elections be delayed until 26 February, a demand which Ebert is forced to accept as the military situation in Berlin falls out of his grasp.*

### 1919

* *The Spartacus League forms the Communist Party of Germany (KPD) on 16 January from a split in the USPD. Party leaders Rosa Luxemburg and Karl Liebknecht are able to convince the KPD to participate in the upcoming parliamentary elections. They begin campaigning for the elections, with the delay until February being crucial in giving them time to establish support.*
* The Paris Peace Conference begins on 18 January.
* The Monarchy of the North is established in Portugal on 19 January. Although it captures support in the city of Porto, it collapses on 14 February due to poor organization.
* The Polish-Soviet War begins on 14 February after Polish forces invade Soviet Belarus and engage in the Battle of Bereza Kartuska.
* *Parliamentary elections are held in Germany on 26 February 1919. The KPD comes in second place, close behind the SPD.*
* The Communist International (Comintern) is founded on 2 March.
* *Friedrich Ebert is elected as the first President of Germany through an indirect parliament vote on 15 March 1919.*
* On 21 March, the Hungarian Soviet Republic is established by socialist revolutionary Béla Kun, overthrowing the liberal Hungarian People's Republic. The Hungarian Communist Party expands its support base.
* The Italian Fasci of Combat is formed on 23 March by Benito Mussolini. It will be the predecessor to the National Fascist Party.
* *The Bavarian Soviet Republic is formed on 6 April. Initially led by the playwright Ernst Toller, the KPD sent their own representatives led by Munich native Johannes Becher, who takes control of the government. The Bavarian Red Army is formed to defend the republic.*
* *In mid-April, the Communist Party of Germany (KPD) and the Independent Social Democratic Party (USPD) sponsor a planned mass strike on May Day. On 28 April, mere days before the strike, revolutionary workers councils are reassembled. The SPD hastily attempts to prepare the Freikorps and the Reichswehr, but is hindered by internal conflicts with the right-wing.*
* *Strikes and demonstrations erupt across Germany on 1 May, or May Day. Millions of workers and soldiers flood into the streets in cities across the country. The Reichswehr is ordered to fire on the demonstrators, but in many cases they mutiny. The Freikorps attacks demonstrators in Berlin, triggering the escalation towards revolution. Armed workers, backed by mutinous soldiers, seize Berlin and various other major cities. This marks the start of the May Revolution, and therefore the German Civil War.*
* *The Turkish Nationalist Revolt commences on 19 May under the leadership of Mustafa Kemal Pasha.*
* *Now backed by the United Kingdom and the Russian White movement, the German Baltische Landeswehr defeats the Estonian Army at the Battle of Cēsis. Estonia and the Baltische Landeswehr subsequently sign a ceasefire and join forces to fight the Bolsheviks. The abandoned Latvian government collapses.*
* **WIP**