1) Store in hero w var the battles he won (IF:W-1)
2) When battle =x, ask him to build a mine on right-click (CM)
3) Check if already enough mines on map (DO loop)
4) If ok, check if location clicked is in player view (!!TR1:V?i check visibility)
5) Check if can build at that location (TR:E/P)
6) Ask which mine he wants (IF:G1 dialog)
7) Place the mine (UN:I)
8) Assign a number to the mine (UN:C), I think is necessary to avoid duplicates
9) Reset hero w var

So, for a simple thing as adding a mine, you have to browse large parts from erm help. Is not one command.