Velasco goes to G-6 to lay mines, then both ships head back to port.
This scenario is heavily stacked in my favor, not sure what you could have done all that different.
Having 6 mines now, you get to place you instillation. I guess it has to go on one of your three back rows. But not sure if you place first, and if it can be moved on a following match.
3. If you start a game with 6 or more mines on the map, also bring Axis heavy cruiser Canarias and an Allied shore battery. The Allies can use any trawlers that have not yet been sunk.