instruction: Extract what units are strong against countering cavalry from the following text
context: The Age of Kings also includes five types of military units: infantry, archers, cavalry, siege weapons, and naval units. Certain types of infantry, archers, and cavalry are "counter units" with special defenses against other types of units. The three human classes of military generally follow a rock-paper-scissors model. For example, infantry are generally powerful against buildings but weak against cavalry, thus the infantry counter units—spearmen and pikemen—have attack bonuses against cavalry.
response: Spearman and Pikemen are effective counters to Cavalry