arcmap - How to divide polyline into 1-mile increments?

I have a river shapefile that I need to break up into 1-mile increments.

The polyline is 53 miles in distance, so I should I have about 53 mile markers as a result.

I have tried the Divide tool, but then it doesn't show if it did anything afterwards.

Should I manually use the Split tool to split the river at every mile increment, or is there a better way to do this?

I am creating a river mile map.