From the summer of 1943 onwards, the Allied superiority grew in the air, partly due to the help of the Americans and partly due to the relative reduction of the number of planes by the Germans. During the day, American bombers attacked and at night, the British attacked with their planes, which had a greater load capacity. Fuel shortages for the Germans meant that during the latter part of World War II, German fighter jets had difficulty coming up in defense. In 1943, the German courier flight over Sweden culminated. However, the regulations were changed during the latter part of the year when only civilian-registered plans were allowed to be used.

Between January 2 and March 30, the RAF carried out several mine clearances from flights in the Kattegat for a total of 49 nights.

On February 11, the German steamship Kurt Hartwig Siemers ran aground and sank at Nidingen. The ship, which was 1147 brt and was built at Wilton Scheepswerf & Machinefabriek in Rotterdam in 1918, was 70 m long and 11 m wide and was then sunk on its way from Gothenburg to Germany with paper bales. All 22 men on board were rescued.

On February 26, a Junker 88A5 crashed in the Kattegat. The plane was at the time out on a night navigation exercise when the plane crashed into the sea and the entire crew died.

On April 1, the Swedish submarine HMS Ulven went on a German mine southwest of Pölsan and sank. All 33 on board died. When Ulven went to the mine, the Swedish Navy had swept mines down to 15 m, but after the accident they changed the routines and swept down to 20 m, which meant that more mines were found. On August 2, the submarine was rescued by the Swedish Navy.

On April 4, the Norwegian steamer Rygia went to a mine near Skagen and sank.

On April 29, the Lancaster W4898 crashed during a mine clearance in the Kattegat.

On May 17, the Norwegian ship Bygdöy sank after going on a mine in the Kattegat.

On May 28, the German Sperrbrecher 22 sank.

On June 27, the steamer Sigrid exploded and sank after going on a mine.

Between 17 September and 9 October, the RAF carried out several mine clearances from flights in the Kattegat for 14 nights.

On 13 October, the German transport vessel S / S Telde was sunk at 2969 GRT off Ålborg.

Between December 16 and January 1, the RAF carried out several mine clearances from flights in the Kattegat for 7 nights.

On December 16, the German minesweeper R-54 was sunk at Anholt. On the same day, it was noted in Hallandsposten that it was time to buy the last Christmas presents before Christmas.