Changes

| location    =Europe<br/>North and eastern Africa<br/>Middle East<br>Atlantic Ocean<br/>

| location    =Europe<br/>North and eastern Africa<br/>Middle East<br>Atlantic Ocean<br/>

| combatant1  ='''Triple Entente''', '''Allies'''<br/>[[Great Britain]]<br/>[[France]]<br/>[[Russia]] (1914-17)<br/>[[Italy]] (1915-18)<br/>[[United States]] (1917-18)<br/>[[Romania]] (1916-18)<br/>[[Japan]]<br/>[[Serbia]]<br/>[[Belgium]]<br/>[[Greece]] (1917-18)<br/>[[Portugal]] (1916-18)<br/>[[Montenegro]] (1914-16)

| combatant1  ='''Triple Entente''', '''Allies'''<br/>[[Great Britain]]<br/>[[France]]<br/>[[Russia]] (1914-17)<br/>[[Italy]] (1915-18)<br/>[[United States]] (1917-18)<br/>[[Romania]] (1916-18)<br/>[[Japan]]<br/>[[Serbia]]<br/>[[Belgium]]<br/>[[Greece]] (1917-18)<br/>[[Portugal]] (1916-18)<br/>[[Montenegro]] (1914-16)

| combatant2  ='''Triple Alliance''', '''Central Powers'''<br/>[[Germany]]<br/>[[Austria-Hungary]]<br/>[[Ottoman Empire]]<br/>[[Bulgaria]](1915–18)<br/>[[Romania]](1941–44)<br/>[[Bulgaria]](1941–44)<br>[[Soviet Union]] (til 1941)<br/>

| combatant2  ='''Triple Alliance''', '''Central Powers'''<br/>[[Germany]]<br/>[[Austria-Hungary]]<br/>[[Ottoman Empire]]<br/>[[Bulgaria]](1915–18)

| commander1  =  

| commander1  =  

| commander2  =  

| commander2  =