Battle Line is a 3-card poker game by Reiner Knizia. Although it is published by a wargame publisher, GMT Games, the theme is shallow and basically a two-player poker variant. It is a short but tense game of risk and hand management.
The game plays like this. Each player starts with a seven-card hand from a 60-card deck composed of six suits, ranging from from 1-10. A battle line is formed by placing six flags. On your turn, you play one card to a flag, face-up, then draw a card from a common draw pile. When three cards are played on a flag, it is be compared against the three card hand on the opposite side of the flag, for capture.