New Year New Campaigns
After wintering in Saxony, Frederick decided to immediately invade Bohemia again, before French or Russian forces could reach the area and support the Austrians. On April 18,1759 the main Prussian army advanced in multiple columns through the Ore Mountains, seeking a decisive engagement with Browne's forces, while the Silesian garrison under Schwerin advanced from Glatz to join them. On April 21 Bevern's column encountered an Austrian corps led by Count Königsegg near Reichenberg; the ensuing Battle of Reichenberg ended in a Prussian victory, and the Prussian forces continued to advance on Prague.
The invading columns reunited north of Prague, while the retreating Austrians reformed under the command of Prince Charles of Lorraine to the city's east, and on May 6 the two armies fought the Battle of Prague. Both sides suffered heavy casualties, and both Browne and Schwerin were killed, but the Prussians forced the Austrians back into the fortified city, which the invaders then besieged. Learning of the attack on Prague, Austrian commander Count Leopold von Daun advanced from the east with a force of 30,000 men. Daun arrived too late to join the Battle of Prague, but he collected thousands of scattered Austrians who had escaped from the battle; with these reinforcements he slowly moved to relieve the city.
Trying to simultaneously besiege Prague and face Daun, Frederick contemplated dividing his forces. In late May however a 45,000 strong Russian Army under Field Marshal Stepan Fyodorovich Apraksin reinforced a 19,000-man army under Bevern at nearby Kolín and assess the situation. Now with a sufficient force to resist Daun's advance, Bevern and Apraksin attacked the Austrian position. The resulting Battle of Kolín on June 18 ended in a decisive victory for the Grand Alliance virtually destroying Daun’s army.
With no prospect of being relieved, Austrian forces in Prague surrendered on July 2 effectively giving all of Bohemia to the Grand Alliance. By September, nearly 120,000 Russo-Prussian forces were nearing Brno and the main Austrian fortress in Moravia.
Before stopping for the winter Dutch-Hanoverian forces had moved into the Austrian Netherlands capturing Antwerp on November 1, 1758 after a three week siege. On March 8,1759 Field Marshall Ernest and 35,000 Dutch troops began a new campaign west from Antwerp towards Ghent while the Duke of Cumberland moved south towards Brussels with 50,000 hoping to keep France from consolidating their forces in one area. Ghent was defended by only 18,000 troops and after only five hours. After a quick refit Ernest was on the move once more charging towards the French border. France however was no longer alone as 30,000 Stuartist troops led by the Bonny Prince himself had recently arrived and on May 9 decisively defeated Ernest at the Battle of Ypres. Following the defeat Ernest withdrew to Ghent hoping to guard Cumberland’s flank as he besieged Brussels.
Sweden’s naval supremacy in the Baltic kept their positions more or less safe in Finland and Pomerania for the remainder of 1758. This supremacy however was to be short lived. On March 29,1759 a new state entered the war when a Danish fleet under Admiral Frederik Christian Kaas launched a surprise attack on the main Swedish fleet at the Battle off Gotland virtually destroying it. Eight days later Malmo was bombarded as 25,000 Danish forces invaded across the strait from Copenhagen while an additional 7,000 moved out of Norway marching on Gothenburg. The attack caught Sweden completely by surprise throwing a wrench into their spring plans. Malmo would fall after only five days allowing Danish forces to move further into Scania while the invasion force from Norway besieged Gothenburg on April 19.
As Denmark attacked Sweden proper 40,000 Prussian and Russian troops launched a new invasion of Pomerania on April 12. This time the allies blew through any defenses and ten days later began assaulting Stralsund. After four days of intense fighting Stralsund fell and within another week all Swedish Pomerania was occupied. In Finland Lopukhin launched a new assault on Helsinki with 110,000 men. Though the Swedes fought to halt the Russian horde they were outnumbered nearly 4-1. On May 15 after a brutal eight day fight the Battle of Helsinki ended with the Russian flag flying above the ruined city.
The entrance of Denmark into the war was the final nail into the coffin for Sweden and on June 1,1759 sued for peace with the Grand Alliance. Three weeks later Sweden officially left the war after signing the Peace of Flensburg.
Terms of the Peace of Flensburg were:
- Swedish Pomerania ceded to Prussia
- Scania ceded to Denmark
- Sweden retained Finland but forced to cede Gotland and the Aland Islands to Russia
- Demilitarization of Finland
- Surrendered remaining ships of the Swedish Navy to the allies.