Once... no, that word wasn't accurate. It should be said that in the future, there would be a chuunibyou teenager who constantly shouted, "Explosion is art!" Using a certain special Earth Release Ninjutsu, he would ride a Clay Bird at low altitude and easily infiltrate Sunagakure Village.
Then, from midair, he would toss out all sorts of clay bombs, shouting "Drink!" again and again as he carpet-bombed the place.
If the Fifth Kazekage at the time had not already encountered a miraculous ninjutsu comparable to Kotoamatsukami, and been hit by some Talk no Jutsu Ninja's SSS-rank forbidden technique, receiving a long-term buff similar to "Protect Sunagakure," he would not have stepped forward during that disastrous air raid and protected the village at the cost of being captured.
One could imagine that without Gaara, Sunagakure would have been blown to pieces back then.
Of course, the chuunibyou teenager's main target had been the Jinchuriki and the Tailed Beast, not the destruction of Sunagakure.
But now, someone was preparing to use the same method of infiltration to enter Sunagakure, with the sole purpose of causing destruction.
The chuunibyou teenager's personal experience proved the gaps in Sunagakure's air defenses. In fact, it was not just Sunagakure; all the major ninja villages were the same. Aerial attacks had always been difficult to defend against.
Although Hagoromo's Yata Crow did not possess such a diverse range of attack methods, and the explosive effect of its individual attacks was nowhere near as outrageous as large-scale Explosive Clay, it had one advantage: there was plenty of it. If one bomb couldn't blow you apart, no problem—we had a whole pile more.
After flying for a while, not a trace of sound from the battlefield could be heard anymore.
At high altitude, Hagoromo could control the Yata Crow