You are working under the assumption that anarchist communes couldn't federate with each other to defend a wider territory.

Although, I have to admit I wouldn't call myself the best read, but I think the communes in Spain should give an example of such things being totally possible and actually working quite well.

During the Spanish Civil War, workers in occupied factories coordinated an entire wartime economy. Anarchist organizations that had been instrumental in bringing about the revolution, namely the CNT labor union, often provided the foundations for the new society. Especially in the industrial city of Barcelona, the CNT lent the structure for running a worker-controlled economy — a task for which it had been preparing years in advance. Each factory organized itself with its own chosen technical and administrative workers; factories in the same industry in every locality organized into the Local Federation of their particular industry; all the Local Federations of a locality organized themselves into a Local Economic Council “in which all the centers of production and services were represented”; and the local Federations and Councils organized into parallel National Federations of Industry and National Economic Federations.[49]

The Barcelona congress of all Catalan collectives, on August 28, 1937, provides an example of their coordinating activities and decisions. The collectivized shoe factories needed 2 million pesetas credit. Because of a shortage of leather, they had to cut down on hours, though they still paid all their workers full time salaries. The Economic Council studied the situation, and reported that there was no surplus of shoes. The congress agreed to grant credit to purchase leather and to modernize the factories in order to lower the prices of the shoes. Later, the Economic Council outlined plans to build an aluminum factory, which was necessary for the war effort. They had located available materials, secured the cooperation of chemists, engineers, and technicians, and decided to raise the money through the collectives. The congress also decided to mitigate urban unemployment by working out a plan with agricultural workers to bring new areas into cultivation with the help of unemployed workers from the cities.

Or take the example of Native Americans resisting their colonizers:

Even more impressive than the example provided by the Makhnovists is the victory won by several indigenous nations in 1868. In a two year war, thousands of warriors from the Lakota and Cheyenne nations defeated the US military and destroyed several army forts during what became known as Red Cloud’s War. In 1866, the Lakota met with the US government at Fort Laramie because the latter wanted permission to build a military trail through the Powder River country to facilitate the influx of white settlers who were seeking gold. The US military had already defeated the Arapaho in its attempt to open the area for white settlers, but they had been unable to defeat the Lakota. During the negotiations it became apparent that the US government had already started the process of building military forts along this trail, without even having secured permission for the trail itself. The Oglala Lakota war chief Red Cloud promised to resist any white attempts to occupy the area. Nonetheless in the summer of 1866 the US military began sending more troops to the region and constructing new forts. Lakota, Cheyenne, and Arapaho warriors following the direction of Red Cloud began a campaign of guerrilla resistance, effectively closing down the Bozeman trail and harassing the troops stationed in the forts. The military sent down the order for an aggressive winter campaign, and on December 21, when their wood train was attacked yet again, an army of about one hundred US soldiers decided to pursue. They met a decoy party including the Oglala warrior Crazy Horse and took the bait. The entire force was defeated and killed by a force of 1,000–3,000 warriors that waited in ambush. The commanding officer of the white soldiers was knifed to death in hand to hand combat. The Lakota left a young bugle boy who fought with just his bugle covered in a buffalo robe as a sign of honor — with such acts the indigenous warriors demonstrated the possibility of a much more respectful form of warfare, in contrast with the white soldiers and settlers who often cut out fetuses from pregnant women and used the amputated genitals of unarmed victims as tobacco pouches.

In the summer of 1867 US troops with new repeating rifles fought the Lakota to a standstill in two battles, but they failed to carry out any successful offensives. In the end, they asked for peace talks, which Red Cloud said he would only grant if the new military forts were abandoned. The US government agreed, and in the peace talks they recognized the rights of the Lakota to the Black Hills and Powder River country, a huge area currently occupied by the states of North Dakota, South Dakota, and Montana.

During the war, the Lakota and Cheyenne organized without coercion or military discipline. But contrary to the typical dichotomies, their relative lack of hierarchy did not hamper their ability for organization. On the contrary, they held together during a brutal war on the basis of a collective, self-motivated discipline and varying forms of organization. In a Western army, the most important unit is the military police or the officer who walks behind the troops, pistol loaded and ready to shoot anyone who turns and runs. The Lakota and Cheyenne had no need for discipline imposed from above. They were fighting to defend their land and way of life, in groups bound by kinship and affinity.

Some fighting groups were structured with a chain of command, while others operated in a more collective fashion, but all of them voluntarily rallied around individuals with the best organizational abilities, spiritual power, and combat experience. These war chiefs did not control those who followed them so much as inspire them. When morale was low or a fight looked hopeless, groups of warriors often went home, and they were always free to do so. If a chief declared war, he had to go, but no one else did, so a leader who could not convince anyone to follow him to war was engaging in an embarrassing and even suicidal venture. In contrast, politicians and generals in Western society frequently start unpopular wars, and they are never the ones to suffer the consequences.

The warrior societies played an important role in the indigenous organization of warfare, but women’s societies were vital as well. They played a role similar to that of the Quartermaster in Western armies, provisioning food and materials, except that where the Quartermaster is a simple cog obeying orders, the Lakota and Cheyenne women would refuse to cooperate if they disagreed with the reasons for a war. Considering that one of Napoleon’s most important contributions to European warfare was the insight that “an army marches on its stomach,” it becomes apparent that Lakota and Cheyenne women exercised more power in the affairs of their nations than the histories written by men and white people would lead us to believe. Additionally, women who chose to could fight alongside the men.

Despite being impossibly outnumbered by the US military and white settler paramilitaries, the Native Americans won. After Red Cloud’s War, the Lakota and Cheyenne enjoyed nearly a decade of autonomy and peace. Contrary to pacifist allegations about militant resistance, the victors did not begin oppressing one another or creating uncontrollable cycles of violence just because they had violently fought off the white invaders. They won themselves several years of freedom and peace.

FYI the quotes are from Gelderloos' "Anarchy Works".

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The condition for the state withering away is the end of class conflict. The state is merely an instrument of class conflict, through which one class exerts its will and dominance over the other. So long as there is a capitalist class anywhere in the world that is organized militarily and is capable of re-asserting itself as a dominant geopolitical force, then the conditions that necessitate a proletarian state still exist and the withering away of that state would be premature.