Chisholm Trail (video game)

The Chisholm Trail is a computer game released in July 1982 for the Texas Instruments TI-99/4A personal computer.
Game Play.
Players take the role of a cattle driver on the Chisholm Trail, bringing their cattle to set destinations while defending them against cattle rustlers and wranglers. The game has nine levels. You can choose any of the levels from the start menu and the level selected determines how long you have been on the trail, how many steers you have, how many shots you have, and how many wranglers and rustlers must be eliminated. 
Wranglers are in the form of brands and will try to brand the steers for themselves. Mileage counts as the score and Rustlers are worth 250 miles and Wranglers are 150 miles. Every time 10,000 miles is reached another steer is added to the group.