Brazilian camp in Chaco

Scene depicted at dusk. In the foreground, on the left, a camp with tents lit by bonfires and groups of people, some of them kneeling on the ground around several injured human bodies. In the center, two men with religious habits. On the right, river with reflection of the moon in its waters. On the margin, two men on horseback. On the other side of the bank, houses lit up inside and vegetation with palm trees. Dark blue sky with clouds and moon on the right. Author's signature and date / place (?) illegible in the lower right corner in red ink: "E. De Martino /.........".