《周书·列传·卷十四》
贺拔岳缓缓推进，原来埋伏下的骑兵随贺拔岳前进，骑兵人数逐渐增多，贼人猜不出有多少。
岳渐前进，先所置骑随岳而进，骑既渐增，贼不复测其多少。
He Bayue advanced slowly and the cavalrymen he had hidden earlier followed him forward, the number of cavalrymen gradually increasing and the raiders unclear on how many there were.
<s>[INST] For each of the following sets of Classical Chinese and Modern Chinese sentences, provide an English translation that captures the essence of both: Classical: 岳渐前进，先所置骑随岳而进，骑既渐增，贼不复测其多少。 Modern: 贺拔岳缓缓推进，原来埋伏下的骑兵随贺拔岳前进，骑兵人数逐渐增多，贼人猜不出有多少。 [/INST] He Bayue advanced slowly and the cavalrymen he had hidden earlier followed him forward, the number of cavalrymen gradually increasing and the raiders unclear on how many there were.</s>
For each of the following sets of Classical Chinese and Modern Chinese sentences, provide an English translation that captures the essence of both: Classical: 岳渐前进，先所置骑随岳而进，骑既渐增，贼不复测其多少。 Modern: 贺拔岳缓缓推进，原来埋伏下的骑兵随贺拔岳前进，骑兵人数逐渐增多，贼人猜不出有多少。
user
He Bayue advanced slowly and the cavalrymen he had hidden earlier followed him forward, the number of cavalrymen gradually increasing and the raiders unclear on how many there were.
assistant