China’s Intrusions At LAC, 20 Soldiers Dead: Intelligence Deficit?

Are intelligence failures to be blamed for the multiple incursions that have been made by the Chinese Army across the Line of Actual Control? In Ladakh, at Depsang, Galwan Valley, Pangong Lake, even in Arunachal Pradesh, multiple intrusions, take-over of land on India's side of the LAC, building of permanent posts, bringing in of heavy weapons, etc, has been reported. Is there an intelligence deficit at the LAC? Does intelligence not reach our forces at the border? Or is credible intelligence ignore back in Delhi? Was the fierce clash between Indian and Chinese forces at the Galwan Valley, which left 20 Indian soldiers dead, a result of an intelligence failure?