Along the Ho Chi minh trail Young volunteers kept open 2195 km of strategic roads And guarded 2500 key points.....pls explain this line in simple words

The above line states that specific roads were constructed to transport goods and materials needed to fought with the enemy. Along the  trail named after the leader Ho Chi Minh, young volunteers kept the route open for about 2195 kms with support bases and hospitals.They even guarded 2500 key points from where attack by the enemy is likely.