The 10-year-old boy who assaulted a 7-year-old playmate in Aspen Hill during the summer was committed yesterday to the Montrose School, a state juvenile training facility near Baltimore.

The school, which serves boys up to age 15 and girls of all ages, offers a school program and limited therapy, juvenile officials said. They said that the 10-year-old eventually may be placed in another facility where he can receive special counseling.

"This may be an interim placement," one official said.

Judge Douglas Moore of the Montgomery County Juvenile Court handed down the commitment ruling after a two-hour, closed hearing attended by the boy, his mother, the family's attorney and the prosecuting attorney.

The 10-year-old was found delinquent last month on charges of assault with intent to maim, assault and battery and making a false statement to police in the incident, which occurred July 19 in an area near Turkey Branch Creek. Initially, the 10-year-old told his family and police that he and his friend, Steven Wilson Jr., had been approached by two teen-agers carrying fold-up knives. The 10-year-old said he had escaped but that Steven had fallen down a steep embankment and been assaulted by the older boys.

Wilson suffered multiple facial cuts and head injuries in the attack.

Police charged the 10-year-old with the attack five days later. He has been in the Noyes Juvenile Detention Center near Rockville since those charges were filed.

Attorneys defending the boy contend that what happened that day was an accident.

A restitution hearing has been scheduled for Nov. 14, court officials said. At that time, Judge Moore could order the parents of the 10-year-old boy to pay for the medical expenses of up to $5,000 incurred by the Wilson family.