I salute the bravery of any soldier. I'm sure the Indian troops fought hard.
As for the rest, Pakistan never had 90,000 troops in Bangladesh. The figure includes families, who were at risk of being butchered by the rebels, civilian staff, police and paramilitary.
From the detailed account of Major R.G.Kyle.
Indian-Pakistan War of 1971: A Modern War
At the beginning of December, Islamabad had realized
that the Indians were massing to attack into East Pakistan.
Although Pakistan had
approximately 40,000 troops deployed
there, the preceeding months of guerrilla war had taken its
toll.
The India-Pakistan War
Of 1971: A Modern War