| obelisk | a tall stone pillar built to commemorate a person or an important event | 
| objective | a place or position towards which forces are directed | 
| occupation | the control of a territory by a foreign military power | 
| offensive | a carefully planned attack made by a large formation or group of soldiers | 
| Order of Battle | the units, formation and equipment of a military force; might include its identification, strength and command structure, and the disposition of the personnel | 
| Ottoman Empire | the former Turkish empire in Europe, Asia and Africa, from the late 13th century until the end of World War I | 
| outflank | to go around the flank of an opposing army by moving past it so it can be attacked from the side | 
| outpost | a small group of buildings used for military purposes in a distant part of the country or in a foreign country | 
Newsletter
Monthly updates on new content, free resources and commemorations.
We'll protect your details in line with our Privacy Policy. Learn about our newsletter.