Airdale War
| Airdale War | |||||||||
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| Belligerents | |||||||||
 Sunrosia |
 Estmere | ||||||||
| Commanders and leaders | |||||||||
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| Strength | |||||||||
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4,658,000 | |||||||||
| Casualties and losses | |||||||||
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The Airdale War, also known as the Estmerish-Sunrosian War, was a military conflict between the Sunrosian Monarchy and the Kingdom of Estmere. Lasting from 13 May 1918 to 23 November 1921, the conflict was primarily caused by Sunrosian claims to the Airdale region, lost to Estmere in the War of the Triple Alliance.
On 6 May 1918, the Sunrosian government of Rudolph von Waldriek issued an ultimatum to Estmere, requiring the cession of the three border counties of Ashdale, Bardonshire, and Gulval within 48 hours. A general mobilisation was ordered on the same day by Sunrosia, confidently expecting a negative answer. On 8 May 1918 at 4 PM, as the deadline ran out and the Estmerish government failed to answer positively, the Sunrosian government officially declared war on Estmere, with several Sunrosian units having already started hostilities an hour early.