METAL SLUG ANTHOLOGY

In order to "rescue" a prisoner in a level, you must free them from their captivity AND finish the level without dying after getting them or else they become recaptured and you lose them from your count towards your end total. You can still get the trophy if you lose prisoners during your level playthrough as long as you have 10 by the time you finish the level.

The first level is probably the easiest to get this trophy as the level itself isn't that difficult to complete without dying. The location of the missions prisoners are as follows:
 

(Note: The video shows the locations of all the prisoners throughout the level even if I don't have them all still saved by the end)

• 1 & 2: They are right near the beginning of the game on a little ground section
• 3: A little further down river, he is hanging from the top of the screen
• 4: He is on the floor right as you enter the temple
• 5: Right after you enter the second part of the temple, he will be on a raised platform
• 6: He's on top of a totem type doorway right after you get your tank
• 7 & 8: Right as you enter a new part of the temple, they will be hanging from the ceiling
• 9: When you reach the top of a set of stair like platforms, he'll be at the top of them
• 10: He will on the floor right in front you in the section of the temple right after you defeat the mini-boss
• 11 & 12: They will right after you destroy a totem doorway shortly after the previous prisoner
• 13, 14 & 15+: He come from the left side of the screen during the boss fight