Albert Barnes Commentary Exodus 1:10

"come, let us deal wisely with them, lest they multiply, and it come to pass, that, when there falleth out any war, they also join themselves unto our enemies, and fight against us, and get them up out of the land." — Exodus 1:10 (ASV)

Any war - The Northeastern frontier was infested by the neighboring tribes, the Shasous of Egyptian monuments, and war was waged with Egypt by the confederated nations of Western Asia under the reigns of the successors of Amosis. These incursions were repulsed with extreme difficulty. In language, features, costume, and partly also in habits, the Israelites probably resembled those enemies of Egypt.

Out of the land - The Pharaohs feared the loss of revenue and power, which would result from the withdrawal of a peaceful and industrious race.