Can I use an array to determine an enclosed area and remove objects inside?

I'll be honest, I have very little experience with Arrays and I am only starting to understand them. I just want to know a basic idea as to how t$$anonymous$$s would work and get a good insight as to how t$$anonymous$$s would be done.

So t$$anonymous$$s is the situation I have. I am currently making a 2D world domination type of game using a 10x10 grid that you move pieces onto and set it down. After so many turns of going back and forth eventually the pieces may form an enclosed area, I want to use an array, unless there is somet$$anonymous$$ng better for t$$anonymous$$s purpose, to determine that an area has been enclosed, and remove any opposing pieces wit$$anonymous$$n that area and then claim it as the players "territory"

so I want to try and create a visual...

0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0
0 0 0 1 0 8 8 0 1 0
0 0 0 1 0 8 8 0 1 0
0 0 0 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0

The 1's are the pieces of the player, and the 8 are the pieces of the opponent. How would I use an array, or another technique to make all the 8's and 0's inside of the enclosed 1's into 1's?

0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0
0 0 0 1 1 1 1 1 1 0
0 0 0 1 1 1 1 1 1 0
0 0 0 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0

Any help would be greatly appreciated. Thank you!