I have 3 Black Sea missions I created for the 30th Flot. I had to also create the ports od Odessa, Sevastopol, Feodosiya, Novorossisk, Rostov, and Batum. Batum is the only port that stayed in Russia's control throughout the war. The rest went back and forth between Germany & Russia.
Batum is a rich oil & mineral port so tankers were a good convoy target of opportunity.
Here's the timeline of control:
Odessa:
16/10/1941 Odessa falls to the Romanians after a Soviet evacuation by sea. During the 2 month siege, the Romanians have suffered 98,000 casualties.
10/04/1944 The Russians enter Odessa on Black Sea as German forces withdraw from the city to the west bank of the Dniester river.
Novorossiysk:
06/09/1942 The 4th Gebirgsjäger division of the 17th Army captures the Black Sea naval base of Novorossiysk.
10/09/1943 Soviet marines supported by naval units of the Red Fleet recapture the Black Sea port of Novorossiysk.
Rostov-on-Don:
22/11/1941 The 3rd Panzer Korps captures Rostov-on-Don.
28/11/1941 Overextended and short of supplies, the 3rd Panzer Korps evacuates Rostov and withdraws to the Mius river, 30 miles to the West.
29/11/1941 Depleted by continuous savage fighting, blizzards and sub-zero temperatures, Army Group Centre's offensive begins to grind to a halt as German units find it increasingly difficult to make ground. The Russians launch a counter-attack at Rostov-on-Don, forcing the German to evacuate the city and withdraw west towards the river Mius.
24/07/1942 Rostov-on-Don is captured by the 1st Panzer Army, thus clearing the way for the advance of Army Group A toward the Caucasus and Kuban region. Large numbers of Russian troops are liquidated in and around Rostov after German troops have secured the city.
28/12/1942 In the face of the continuing Soviet offensive toward Rostov-on-Don, Army Group A is ordered to withdraw its forces from the Caucasus.
12/02/1943 Rostov is captured by Russians. German troops evacuate Krasnodar and reach the defensive positions in the Kuban bridgehead.
Sevastopol:
03/07/1942 Sevastopol, the Crimean capital, finally falls to Germans, along with 97,000 Soviet prisoners. The German and Romanian forces lost 24,000 men.
12/04/1944 Hitler authorises a withdrawal of 230,000 German and Romanian troops to the fortress of Sevastopol. However, this is four days too late and the delay results in many unnecessary losses.
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Feodosiya was the last 30th base in '44 and I made a mission (suicidal?) from there to attack Rostov on Don in the swallow Sea of Azov....
I was kinda waiting for a human controled Type IIB to show up... so far that I know of only an AI one is available. I used the Type IID in my missions because they have mission allowable flak guns...
I guess I should upload these to U-Boot.RealSimulation.com or anywhere else that anybody thinks would be good....

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