He was hospitalized and on 25 November he was promoted to lieutenant colonel; after recovering, on 3 July 1917 he was posted in Genoa, but his precarious health conditions forced him to a prolonged stay at the physiotherapy center of the VII Army Corps, which lasted from 14 August 1918 to 6 December 1919.

In March 1930 he was received again by Mussolini, to whom he again expressed the desire to leave for Libya, but the Duce instead gave him command the 80th Blackshirt Legion "Alessandro Farnese" of Parma.

In October 1932 he was temporarily recalled into service with the Royal Italian Army at the disposal of the Ministry of Colonies, being sent to Cyrenaica at the command of the 2nd Libyan MVSN Legion "Berenice".

Except for a period between January and October 1941, when he was seconded attached to the 11th Army on the Greek-Albanian front as MVSN liaison officer, he was commander of the Border Militia until 1943.

On 1 January 1942 he was promoted to Lieutenant General; during the final phase of his period of command, the border militia was engaged in numerous clashes with Yugoslav partisans in the Julian March and in the annexed areas around Fiume and Ljubljana.

On May 14, when the Chief of Staff of the ENR, General Gastone Gambara, fell ill, Mischi was chosen to replace him; however, having never attended the Army War School or any other specialization course, he felt unprepared to fill this position, in addition to resenting the subordinate position of the RSI armed forces towards the German commands (the ENR General Staff had no autonomy over the operational plans and the use of the troops on the front against the Allies, and its efforts were mainly oriented to the contrast of the Italian Resistance).

At the end of July, while retaining the position of Chief of Staff, he received direct orders from Graziani to "normalize" Piedmont, where partisan activity was rampant, employing a division that would have been specially set up for this purpose.

[1][15][16] Mischi opposed the idea of the Valtellina Redoubt, and in the days of the collapse of the Italian Social Republic he retreated from Milan to Lecco, where on 25 April 1945 he attempted suicide by cutting his wrists at the Albergo Moderno.

The trial was held between November 13 and December 3, 1947, with the prosecutor requesting the death penalty; he was acquitted of some charges and sentenced to eighteen years in prison for the others, of which six were pardoned.