Attack + (to / on) (someone / something)

Question

I was wondering which preposition works with the verb "attack"?

1.a- Army forces have been attacking the town since dawn.
1.b- Army forces have been attacking to the town since dawn.
1.c- Army forces have been attacking on the town since dawn.

2.a- I condemn that country for its attacks to civilians.
2.b- I condemn that country for its attacks on civilians.

Personally, I think technically we can use it in the following way:

• Attack somewhere (without any preposition)
  
• Attack on someone (without any preposition)
  Also I think an animal attacks another animal, without any preposition. Accordingly, in my view, the correct choices would be #1.a. and #2.b. I was wondering if I am right? If not, please do me a favor and clarify that to me.

Answer 1

In your first set of examples, “attacks” is a transitive verb with direct object “the town”, so “attacks the town” is correct.

In your second set, “attacks” is a noun, so a preposition is required to provide any further detail. “on” is the correct one to specify the target.