A portion of the protective strategies, 

1] Anti-Elephant Spikes 

The mammoths were utilized to come apart the monstrous entryways of fortifications, so they created entryways with spikes, famously, Anti-Elephant Spikes, to shield against direct risk from elephants. 

( Camel pad : To maintain a strategic distance from the loss of elephants to the elephant spikes, individuals in those circumstances use to make a camel stand parallel to the entryway and the elephant was compelled to smash the camel in the end softening the entryway and up process murdering the camel. Camels were much less expensive than elephants so they could bear the cost of the passing of a camel) (From remarks) 

2] Veil of the Gate 

One of the door of invigorated city Jodhpur, Merti Gate, used to have an extra divider before entryway to avert elephants to break apart the door, and additionally diminish the running separation for wooden logs utilized physically on entryways. 

3] Rims of Boiling Oil 

See those little places over the section, known as Rims of bubbling oils, utilized by the watchmen as the standing point. ( Devgiri Fort, Daulatabad.) 

Comparative structures are found in practically every fortification, as in Jaisalmer Fort, they had extensive rock alongside bubbling water to be put on adversary caught between the two ring of bulwarks. 

4] A dim Passage 

The individuals who cross the fortress needs to go through a pitch dim crisscross give in entry known as Andhari, cut through the stone. It is associated with a few buckles inside , which lead back to the canal. The armed force stowing away inside the dim fenced in area used to execute the stuck adversary officers utilizing lances. 

The opening entryway of this section was secured by an overwhelming iron cover, which could be shut just by rolling, and toxic gasses could be catapulted into trap. 

5]Narrow entries with sharp rakish turns 

The greater part of the fortresses used to have sharp rakish turns in ways, backing off the foe headway. 

(Mehrangarh Fort)

source :- https://en.wikipedia.org/wiki/Ancient_warfare

https://www.quora.com/What-were-the-best-war-strategies-of-ancient-Indians

~ Thanking You 

Ishan Pandey