- After the war from 1741 to 1743 had ended into a total catastrophe for Sweden, the Peace treaty of Turku was signed. The Swedish hat party had started the war without any real preparations, going as far as to declare the war on imperial Russia, before the Swedish troops were even mobilized. The border was again moved towards west. The border line followed now the western most distributary of Kymijoki and again the country was left without any border fortifications.

- With that in mind, the Swedes started again feverishly to fortify the border area. The area of Degerby (which was named Loviisa later on) was chosen initially in 1745 as a site to build a border fortification. The plan was agreed in 1746 to 1747, although the main fortification was to be build to Helsinki, which later on was known as Sveaborg and still remains as a tourist attraction on the coast of Helsinki. However the plan for a border fortification was agreed to be a good one in the area of Degerby (Loviisa), due to the favorable terrain. Additionally, the Svartholm island was to be fortified, which was located on the Debergy bay.

- Like usual, the Swedish plans were great, but the actual implementation was nearly non-existent. The Degerby border fortification could have hold some 8 000 men inside of it, with 2 000 of them actively defending the fortification. The first construction efforts were started in 1748 and some 2 000 men worked at the site later on. According to the plan, the border fortification was suppose to be a hexagonal fortification, with a six bastions. Additionally, different defensive structures were suppose to be protecting the bastions and the fortification, some that would have been located outside of the main fortification. 

- Like stated, in the end the Swedes were again unable to complete their great plans and the biggest and most remarkable memories from the Debergy fortification, are the two bastions, Ungern and Rosen that were nearly completed. The construction of Debergy fortification was ceased completely in 1770. In the war from 1788 to 1790, the battles were not fought in the Loviisa area and when the imperial Russia finally was the attacking side in 1808, the commander of Loviisa, Colonel Lieutenant Munck gave up the fortifications without any fight, in the fear that the city would suffer damage.

- The fun with history is that you can always say, what if? If the fortification would have been completed, it would have blocked the Russian advance from east quite effectively, as the old Vyborg road went and still goes in front of these two bastions, with the cannon holes pointing towards the road.. Going around the fortification would have also been a very difficult task as the sea is on the other side and troops could have been located on the other side. But that is just the "what if?"...

- Bastion Rosen is named after the G. Rosen, who was at that time the governor-general of Finland.

- In a much sadder state than the bastion Ungern, Rosen doesn't look very authentic with these funny looking "hats". However, as seen in the picture 1, the time and weather has done some real and perhaps permanent damage to the casemates, where the bricks are coming off from the roof.

- A postcard dating most likely from the sixties, before the time that the renovation efforts for these two bastions were started. However, if you would remove the roofs from the casemates now, you would get exactly same kind of picture, than the postcard shows.

- The interiors in this bastion are a bit different from bastion Ungern as much fewer casemates are here and at least I couldn't get a picture, that those would have been connected together as well as in bastion Ungern. Either way the interiors are in a bad shape, with even a few graffiti's painted to the nearly three hundred year old walls...