Select from options: How similar are the following two sentences?

the ensuing battle and airstrikes killed at least 10 militants.
an ensuing battle killed at least 10 militants.

Give the answer on a scale from 0 - 5, where 0 is "not similar at all" and 5 is "means the same thing".

Available options:
(i). 0;
(ii). 1;
(iii). 2;
(iv). 3;
(v). 4;
(vi). 5;
(v).