Forts in Rajasthan: Well, what if I say that the most important palaces of Jaipur were just defence stations to protect the Jaipur from outside invaders?
Yes, the most crucial legacy - Nahargarh, Jaigarh, and the Amer fort were built to respond to any kind of invasion in the city and to protect the royals. These three palaces form a trio of "PYADA", " WAZIR", and "SENAPATI" for the protection of royals at that time.
Let's first start with the Pyada, here it will be called as a sacrificial Pawn to protect the others. Well, the Amber Fort of Jaipur was considered a DHUNDHAR (a sacrificial fort) while building.
It has various submerged routes and passages connecting the other two forts and they all have different structures and specifications which ensures this theory that if Amer ever got attacked, the royals will move through the submerged passages to the other two of the "TRIO".
The characteristics of the term can be related to the Nahargarh fort as once the Amer fort gets attacked, the responsibility of the Nahargarh fort comes as its purpose was to evacuate the royals from the Amer fort and to ensure their safety.
It works as a safe house for the royals as it is the safest fort in the trio whose purpose was to support the Jaigarh ( the attacking fort) and to ensure the safety of the royals.
Now if we talk about the main responding fort of the defence of Jaipur, which can be categorized as the strength of the Jaipur- The Jaigarh fort.
Yes, Jaigarh should be categorized as the most powerful, organized, and effective fort of Jaipur for attacking the invasion. The fort possesses a cannon that used to be the largest cannon on wheels at that time- "THE JAIVANA", which was shot only once, and when it did a devastation of area's coverage of 35 kilometres resulting in a lake in Chaksu.
It is also said that many pregnant women suffered miscarriages when it was fired and the soldiers who shot 100 kg of gunpowder became deaf.
Apart from this, Jaigarh was considered as most efficient cannon foundry due to the abundance of iron ore around it.
It is also said that the Jaigarh possesses tunnels through which wind blows fast enough to generate 1300*C, which was used for molten iron ore and reshaping into cannonballs. The Jaigarh was the responsive fort of Jaipur.
This all was set up on the hills of the Aravalli ranges which was called "CHEEL KA TEELA", providing the best possible structure to any ruler and that must be the reason why Jaipur never got attacked by anyone.
Well, apart from this the most important thing about Jaipur was its hospitality which never made any foe to Jaipur.