What does "He did not distinguish between casualties" mean?

I take that to mean that he treated victims from both sides of the battle.

Thank you JPB.

Would any one like to answer what does "taken down" mean in that link:

Context: The former Bethune Memorial House Visitor Centre in Gravenhurst, taken down in May 2011.

1) taken down means "taken (by camera)"
2) taken down means "demolished"
Which is correct?

Probably the second. We 'take down' temporary structures, wooden buildings, etc.