Answer: 4) Our purpose is to see this war through and to win it for justice
Explanation: Lincoln states in the address " It is rather for us to be here dedicated to the great task remaining before us-that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion-that we here highly resolve that these dead shall not have died in vain, " this means that they shall not fail nor surrender simply from fear, but will persevere and try with all their strength to bring justice to those killed and peace to a divided nation.