Invasion of Ruvelka (Siduri War)
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| Invasion of Ruvelka | |||||||||
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| Part of the Siduri War | |||||||||
 Clockwise from top: Syaran infantry on the march during Operation Sarissa; Fort Sirok following a concentrated Syaran bombardment; A Ruvelkan tank during the Siege of Aszód; Ruvelkan troops surrendering after the battle of Hadju-Bihar; Ruvelkan refugees on the road; The ruins of Sopron in 1934. | |||||||||
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| Belligerents | |||||||||
 Republic of SyaraAllmunnika (From 23 April 1934) |
 Principality of Ruvelka | ||||||||
| Commanders and leaders | |||||||||
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Sasko Anastasov Kostadin Zhelyaskov Metodij Kuzmanovski Kliment Gecevski Zdravko Bikić Jirayr Bedrosian | |||||||||
| Strength | |||||||||
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134 divisions 12,204 guns 3,300 tanks 3,285 aircraft 3,150,000 troops | |||||||||
| Casualties and losses | |||||||||
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53,580 killed 211,852 wounded 14,799 missing 834 aircraft lost 1,233 tanks destroyed | |||||||||
The Invasion of Ruvelka, sometimes referred to as the Fall of Ruvelka, marked the beginning of the Siduri War when the Republic of Syara launched Operation Sarissa on 4 April 1934. Although the Principality had anticipated the possibility of a future conflict with Syara, the scale of the invasion was much larger than Ruvelkan High Command had predicted. As a result, Ruvelkan forces were forced to withdraw from their forward bases close to the Syaran-Ruvelkan border to the more established Dorman Line to the east. As fighting continued in the west, which forced Ruvelka to redeploy its forces from the eastern half of the nation, Allmunnika launched its own invasion of the Principality on 23 April.
Syaran forces invaded Ruvelka early on the morning of 4 April, mobilizing enough troops to make a concerted advance across the entirety of the Syaran-Ruvelkan border. A short-lived Ruvelkan counter-offensive was launched in mid-March, but failed to gain any traction and was quickly beaten back. This Ruvelkan defeat gave the Syarans an undisputed advantage, forcing the Principality to reform its defense along the foothills of the Kurilla mountains where they could buy time to draw reinforcements from the east.
On 23 April, the armed forces of Allamunnika invaded Eastern Ruvelka under the auspices of the Syaran-Ruvelkan Frontier Treaty. With their troops in the east out of position and now facing a second front, the Ruvelkan government concluded that the defense of the Kurilla mountains was no longer possible and ordered an emergency evacuation of all governmental personnel to neutral Cacerta. On 8 June, following the Ruvelkan defeat at the Battle of Hadju-Bihar, Syaran and Allamunnik forces possessed full control of Ruvelka and marked the end of the newborn Principality of Ruvelka, although the Ruvelkan government-in-exile refused to formally surrender. Following the end of the invasion, several resistance organizations were formed which would eventually be unified into what became known as the Földalatti, making extensive use of the unbroken Csúcs codes to forward valuable intelligence to the Common Axis during the remainder of the War.