In a perfect example of why you should hold the high ground, during the recent border war between Thailand and Cambodia a Thai U.S. designed M48A5 took out four Cambodian Soviet designed T-55s (possibly Chinese built Type 59s) which were approaching in the valley below.
Vehicle I-D: 
Cold War Zombie tank T-55, they’re everywhere!
Berlin Krise, ‘Game of Chicken’ M48A1 vs. T-54/55!