Local disputes and disagreements, typical of post-Ottoman Greeks before the state was even formed, and ever since, led the secret to the ears of the Turks. However, by buying and misleading them, the Spiliotopoulos brothers escaped arrest. Things did not go as smoothly as that in February 1821, when the Turks heard the first rumors of the impending Greek uprising. They destroyed many gunpowder mills, and conducted a series of arrests and tortures - including Archbishop Theofilos, who was to die in his cell a few days before the area was liberated.
The Spiliotopoulos brothers were not among the arrested ones. The Turks, in order to start their own gunpowder production, sent seven arrested gunpowder craftsmen in Tripoli - but then the latter devised, at the risk of their lives, a genius plot: they produced defective gunpowder for the Ottomans, decisively contributing to the key battle of Valtetsi in May 1821. The Turks were devastated, as Dimitsana's craftsmen justified themselves by saying that gunpowder did not work because it was used while it was still wet.
When the uprising broke out, the Spiliotopoulos brothers increased their gunpowder mills to 14, and produced up to 14 okkas of gunpowder per day (1 turkishokka is the equivalent of 1.28 kg), as well as bullets and cartridges. Thus, Dimitsana was called the "gunpowder reservoir of the Nation".
The site of these old gunpowder mills has now been transformed into a magnificent and impeccably preserved museum, the Open-Air Water Power Museum of Dimitsana. Nestled in the dense nature and with the constant sound of running water, the museum not only explains the history of gunpowder construction in the area, but also digs the way of life of the people there before the industrial revolution came to stay.
The gunpowder mill in the museum is operating to this day, and at regular intervals a museum employee puts its deafening pistons (‘kopania’) into operation - as in the years of the Revolution, with the force of the flow of the crystal clear waters of the Lucius River.