What is the fine-grained topic of the following text: More than 200 of Moore’s 450 men died in that November 1965 Ia Drang Valley combat, surrounded by about 2,000 enemy troops, who also suffered heavy losses; it was the first major encounter between American soldiers and those of the People’s Army of [North] Vietnam and, we now know, only a taste of the terrible war and national soul-searching to come. Only return the topic.
The first major encounter between American and North Vietnamese soldiers in the Ia Drang Valley combat, 1965.