It was a resounding victory.
Exodus 17:13 As a result, Joshua overwhelmed the army of Amalek in battle. (NLT)
It was an overwhelming victory.  They floored the enemy, they devastated the enemy, they crushed the enemy, they overpowered and swamped the enemy and they overthrew the enemy.  It was not a hollow victory.  Victory came at length, but the victory was in favour of Israel and this victory was attributed to God.
Ultimately God will give you the victory. Don’t forget to give God the honour for the victory He gives you.

Exodus 17:15 Moses built an altar there and named it Yahweh-Nissi (which means “the Lord is my banner”).

He took time, made an effort and deliberately honoured God in a lasting and an enduring way.

Exodus 17:16 He said, “They have raised their fist against the Lord’s throne, so now the Lord will be at war with Amalek generation after generation.” (NLT)

It says that God would be at war with the enemy in perpetuity. By choosing to fight against the Israelites, they had in fact chosen to fight against God Himself.  This was not the Israelites fight, but it was God’s and He won.
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