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With a length of 96 meters and a beam of 28 meters HMS Mars, also known as Makalös was one of the mightiest warships during the early years of the Age of Sail.
The Nordic Seven Years' War was fought during 1563-1570 motivated by the Danish dissatisfaction with the dissolution of the Kalmar Union and the Swedish will to break the Danish domination especially in the Baltic Sea trade. Eventually the war ended in a stalemate, neither party gaining any territory, but the earlier Swedish break-up with the Kalmar Union and the independence stayed valid.
To achieve the control of the Baltic Sea and to master the trade there Denmark allied with the former "Queen of Hanseatic League", Lubeck. Sweden was in weak position, without allies, Denmark dominated in the Baltic Sea and controlled the Swedish access to the North Sea by the Danish Sound Dues. Sweden began establishing itself as a rival power of Denmark-Norway.
To challenge the Danish domination, in 1561 Sweden began the building of the mightiest warship the world had ever seen. Still in the 1500's most of the naval battles were fought like the land battles - a man against a man, the "floating castles" sailed towards each other, rammed, the sailors grappled the hooks and boarded on the enemy ship to combat against the foe. HMS Mars presented for a revolutionary step in the naval combat - the Swedish King, Erik XIV searched for more experienced, more modern ways to fight at the sea - if a ship was capable of carrying dozens of cannons it could sink the enemy ship at long-range distances, alternatively the enemy could hoist the white flag and surrender if suffered enough damage, either way the deadly-cost close combat would be avoided.
Constructed only of the finest oak wood Mars was equipped with a "cannonball-proof" hull. Only trees with the exact shape for the hull were qualified enough - the trees cut for shipbuilding and for HMS Mars were enormous of their size and it took hundreds of years for an oak to achieve such a scale - the next time would be during the era of the ironclads. HMS Mars had five decks, two decks for the cannons - 120 pieces of them, the ship was launched in 1563 and weighting 1 800 tons it was the mightiest warship in Europe.
During the Nordic Seven Years' War Sweden achieved victories in naval battles using the new naval doctrines - avoiding the close-combat at the sea, rather sinking or forcing the enemy ships to surrender allowed by the heavy Swedish ships equipped with cannons. HMS Mars entered for her first battle during the First Battle of Öland in 1564, the ship coffers were filled with money and valuables worth of €13 million in today's money in order to hire soldiers from the Northern Germany and gain support from Mecklenburg for the Swedish war effort. During the initial phase of the battle HMS Mars was able to avoid the Danish boarding attempts, but the Danes succeeded in damaging Mars' steering gear. HMS Mars catch fire while it was shot by incendiary-rounds. The Danes boarded the ship and after bitter fighting achieved a victory in the close-quarters against the Swedes. The HMS Mars' coffers were looted, just barely before the fire reached the ship's powder kegs. Of the explosion the bow severed and HMS Mars rose above the sea level, the scrapped ship sank on the scene.
HMS Mars was larger than the other, better-known Swedish flagship, Wasa - built some 60 years later. HMS Mars presented the modern and subversive view in naval combat - ironically it was sank by using the old methods at the sea. After laying 447 years at the bottom of sea the Mars' wreck was discovered in 2011 and confirmed in 2018.