Battle of Horten Harbour
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The Battle of Horten Harbour or the Action at Horten was an engagement that occurred on 9 April 1940 during
Operation Weserübung Operation Weserübung (german: Unternehmen Weserübung , , 9 April – 10 June 1940) was Germany's assault on Denmark and Norway during the Second World War and the opening operation of the Norwegian Campaign. In the early morning of 9 Ap ...
when the Germans launched an amphibious assault on
Karljohansvern Karjohansvern (''Karljohansvern Orlogsstasjon, KJV'') at Horten was the main base for the Royal Norwegian Navy from 1850 to 1963. Background In 1818, it was decided to establish a naval base in Horten. It was first called ''Hortens verft'', an ...
, the Norwegian naval base at
Horten is a town and municipality in Vestfold in Vestfold og Telemark county, Norway—located along the Oslofjord. The administrative centre of the municipality is the town of Horten. The municipality also includes the town of Åsgårdstrand an ...
. After being initially repulsed by Norwegian naval units, German troops headed overland to outflank the base, forcing it to capitulate.


Background

Karljohansvern Karjohansvern (''Karljohansvern Orlogsstasjon, KJV'') at Horten was the main base for the Royal Norwegian Navy from 1850 to 1963. Background In 1818, it was decided to establish a naval base in Horten. It was first called ''Hortens verft'', an ...
, up the
Oslofjord The Oslofjord (, ; en, Oslo Fjord) is an inlet in the south-east of Norway, stretching from an imaginary line between the and lighthouses and down to in the south to Oslo in the north. It is part of the Skagerrak strait, connecting the Nor ...
, had been Norway's main naval base since 1819. On the morning of 9 April two operational ships were in the harbour: the minelayer (present for repairs) and the minesweeper . Approximately 40 percent of their crews were on shore leave at the time. Also present at the base were the dilapidated
coastal defence ship Coastal defence ships (sometimes called coastal battleships or coast defence ships) were warships built for the purpose of coastal defence, mostly during the period from 1860 to 1920. They were small, often cruiser-sized warships that sacrifi ...
s and which, being unarmed, decommissioned training and depot vessels, took no part in the fighting. The commanding officer at the base was Admiral J. Smith-Johansen. Shortly after midnight Admiral Smith-Johansen informed the captain of ''Olav Tryggvason'', T. Briseid, that there had been a battle at the mouth of the Oslofjord, and it was likely that the enemy ships had breached the outer fortifications. Briseid was given orders to open fire on any hostile ships. Smith-Johansen shared his intentions to send ''Rauma'' and out to sweep the fjord. Briseid dispatched one of his ship's motor boats to Langgrunn where it told the merchant ships at anchor to extinguish their lights.Forsvarets museer
Olav Tryggvason kampene i Horten
(in Norwegian)
The German forces allotted to attack Horten were from ''Kampfgruppe'' 5. This consisted of the torpedo boats and under the command of
Siegfried Strelow Siegfried is a German-language male given name, composed from the Germanic elements ''sig'' "victory" and ''frithu'' "protection, peace". The German name has the Old Norse cognate ''Sigfriðr, Sigfrøðr'', which gives rise to Swedish ''Sigfrid' ...
and H. Wilcke respectively. They were accompanied by the motor minesweepers ''R17'' and ''R21'', heavily laden with troops from the light cruiser . Admiral
Oskar Kummetz __NOTOC__ Oskar Kummetz (21 July 1891 – 17 December 1980) was an admiral with the Kriegsmarine during World War II. He also served in the Kaiserliche Marine during World War I. Kummetz was awarded the Knight's Cross of the Iron Cross for his ac ...
ordered the ships at 03:30 to detach from the main force and secure Horten.


Battle

The detached force arrived at the mouth of the harbour at 05:35. The R boats proceeded to make their landings while the torpedo boats held back. ''Olav Tryggvason'', which had been guarding the entrance since 03:15, initially let the vessels pass. The crew soon realized its error and opened fire. The minesweeper ''R17'' was struck just as it pulled alongside the quay, sinking in the shallow water. The ship's
depth charge A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive Shock factor, hydraulic shock. Most depth ...
s detonated at 06:15, causing further casualties. ''Rauma'' returned and began dueling with ''R21''. ''Rauma'' was damaged and its gun crew was wounded, so the ship retreated to the naval base for medical assistance. Two sailors were killed.Forsvarets museer
Rauma (1)
(in Norwegian)
''R21'', also damaged, disengaged. At 07:30 ''Albatros'' tried to directly intervene by heading into the harbour. The boat's course was constricted by the narrow channel it was using, and soon began taking fire from ''Olav Tryggvason''. The ''Albatros'' responded with its forward battery, but it jammed after eight rounds and the damaged ship was forced to retreat. At 08:00 ''Emden'' moved over to support the Germans at Horten, sending around 50 soldiers ashore to attack over the land. Captain Grundmann of ''R17'', seeking to establish communication with the Norwegian naval staff, managed to contact Admiral Smith-Johansen. Bluffing, he declared that a large German force had seized the town of Horten and that it would be bombarded if the admiral did not surrender within half an hour. Smith-Johansen surrendered Karljohansvern at 08:35.


Aftermath

With
Karljohansvern Karjohansvern (''Karljohansvern Orlogsstasjon, KJV'') at Horten was the main base for the Royal Norwegian Navy from 1850 to 1963. Background In 1818, it was decided to establish a naval base in Horten. It was first called ''Hortens verft'', an ...
now subdued, the Germans could focus on taking the forts at the mouth of the Oslofjord. transferred its soldiers to ''R21'' so it could provide gunfire support for an assault on
Bolærne Bolærne is an archipelago in the outer part of Oslofjord, in the municipality Nøtterøy in Vestfold, Norway. The islands have a total land area of 2.6 km². The largest island, Mellom Bolæren, covers 1.1 km². The easternmost island is ...
. That afternoon the ship attacked, but was driven off by 10 rounds from the fort's guns. While maneuvering in the fog to avoid being hit the ship ran aground, becoming a total loss. On the 10 April, Albatros hit the shallows of Gyren, SE of the island Søndre Sandøy. This is at 18 000 m and outside range from both Bolærne and Rauøy forts. The Germans seized a number of ships at Karljohansvern and pressed them into service. ''Olav Tryggvason'' was renamed ''Brummer''; ''Rauma'' became ''Kamerun''; and ''Tordenskjold'' and ''Harald Haarfagre'' were transformed into AA batteries as ''Nymphe'' and ''Thetis'', respectively. Present at the nearby dockyards were the torpedo boats ''Ørn'' and ''Lom'', commissioned by the Germans as ''Schlange'' and ''Eidechse'', respectively. The incomplete torpedo boat ''Balden'' was finished by the Germans and commissioned as ''Leopard''. The crane vessel ''Marinens Flytekran'' was also seized.


Citations


References

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External links


Den Nionde April
Horten Harbour Horten Harbour 1940 in Norway Norwegian campaign April 1940 events