[1] His grandfather, Leon, was a veteran of the January uprising and mayor of Filipów and Sereje, both near Suwałki, Koc's hometown, while his grandmother, Waleria, was part of the Polish National Government.

In the fall of 1909, Koc joined the newly created Revolutionary Association of Nation's Youth (ZRMN),[10] which was introduced into the conspirative Union of Active Struggle (ZWC) by Studnicki,[10] despite fears that the organisation bore a socialist character.

Initially he was responsible for the financial state of the Kraków branch,[7] but Koc was sent to Grodno in late May 1910 by Kazimierz Sosnkowski and Józef Piłsudski (where his retired father lived), so as to make a detailed description of the fortress.

It is probable that it was the reason Koc could complete the officer's course, organized by the Union of Active Struggle in Stróża near Limanowa, in Austrian Galicia, in 1912, and therefore promoted to a higher rank in the ZWC a year later.

[5] On 10 August 1914, Koc came to Warsaw from Druskininkai on the order of Walery Sławek, to take command of the local branch of the Union of Active Struggle in the Russian partition.

[15] He received a task coinciding with his earlier life experience: supporting the newly summoned Lublin's National Department – an organisation aiming at the propagation of Piłsudski's policies (to counteract the Commandment of Legions, controlled by Central Powers).

Which was why it was needed to find a deputy soldier who could substitute the weakened sight, while conducting in the darkOn 18 September 1916, Koc was severely wounded in the Battle of Sitowicze, in Volhynia.

Koc returned to political life in the Legions, where he became one of the founders of the so-called Analphabet Association – a conspirative military organization in the 5th Infantry Regiment supporting Piłsudski's pro-independence policy.

[5] On 10 November 1918, together with Prince Zdzislaw Lubomirski, part of the Regency Council of the Kingdom of Poland, he welcomed Józef Piłsudski and one of his fellow warriors, Kazimierz Sosnkowski, who returned by train to Warsaw from internment in Magdeburg.

[5] Even though Koc was busy as Main Commandant, he served as a referent for the I Department (Organisational) of the Polish Armed Forces on the affairs of POW incorporation, until mid-December 1918.

[5] As the war officially finished, Piłsudski gave Koc command of the newly summoned III Department of the General Staff for the Preparation of Reserves affairs.

[38] While serving in the III Department, Koc was part of a conspiracy organisation called "Honor i Ojczyzna" (1921–23), which was to train new soldiers, maintain morale and depoliticise the army's structure.

According to Marian Romeyko, he was to "supervise" his boss, Władysław Sikorski,[55] a version rejected by Bogusław Miedziński, who claimed Koc, along with other officers from the so-called Koc-group, were eliminated from Warsaw, even though Marszałek did not explain why and how that happened.

[62] As an MP from the Nonpartisan Bloc for Cooperation with the government, he was an informal head of a group of BBWR deputies (from both houses of parliament) from the so-called Eastern Małopolska (i.e. territories of Lwów, Stanisławów and Tarnopol voivoderships) from 1928 to 1929, and again from 1930 on.

At the same time, he was Director of Propaganda Section of BBWR, which, on 30 October 1929, helped him create a new pro-sanation newspaper – Gazeta Polska, where he briefly served as editor-in-chief.

[4] The main reason Koc was nominated for the newspaper edition was to get rid of Wojciech Stpiczyński's radical leftist views,[4] which were not favourable for Walery Sławek, part of Piłsudski's colonels and head of BBWR.

The treaty was the first case when a part of railway line was given for use to a foreign private enterprise, a step lauded by the government (by e.g. showing the importance of Polish loans for Polish-French relations), but equally criticised by the opposition.

[1] The conditions of the loan were much more favorable than the French terms: the project had to be finished in 3–4 years, using materials made in Poland and building additional electrotechnical facilities as well as a power plant near Warsaw, using British capital.

[73] The agreement was signed on 2 August 1933,[74] the fact Koc was very content: The electrification of the Warsaw rail knot will not only have its communicational importance but as well it will positively influence the state of our industry and our working force.

[90] Before leaving, Koc convinced Mościcki to transfer 20 mln zł ($3.77M) from the Bank of Poland for combating unemployment by hiring people to work on road construction.

The results of the subsequent investigation revealed that the culprit was Wojciech Bieganek from Różopole near Krotoszyn, together with his co-conspirator and brother, Jan, who was arrested the day following the failed attempt.

[112] The reports claim that Koc was planning some kind of "St. Bartholomew's massacre" or "Night of the Long Knives", allegedly, with Śmigły-Rydz's support, which was supposed to physically eliminate the Sanational politicians opposing OZN.

[112] The plan was to assassinate 300-1500 people[105] and to imprison an equal number, including: Mościcki; Sławek; Kwiatkowski; Janina Prystorowa, wife of then Marshal of Senate, Aleksander Prystor; and Aleksandra Piłsudska, widow of Józef Piłsudski,[112] with Jerzy Paciorkowski and Zygmunt Wenda leading the massacre.

[105] Moreover, rumours were circulating: right-of-centre Front Morges (Ignacy Jan Paderewski as leader), the delegalised Communist Party of Poland, leftist Sanation faction and the so-called "castle group".

[119] At the dawn of the September campaign, Koc was an advocate of the transfer of gold from Poland's reserves to finance the purchase of the military equipment needed by the Polish army.

A few days later, Koc moved to Bucharest, where he convinced Henryk Gruber, an important businessman, to send a request to the Powszechna Kasa Oszczędności (PKO) branch in New York City (or Paris) to pay him a 2 mln zł loan, which, apparently, was needed for the Army.

For some time, he was part of the council acting as the government, together with the ambassador to France, Juliusz Łukasiewicz; Vice-Minister of Foreign Affairs, Jan Szembek and Stanisław Burhardt-Bukacki.

Koc tried to cut expenditures to the minimum (by e.g. giving out unpaid leaves to most government workers via a declaration on 10 October 1939),[127] in order to preserve as much gold as possible for post-war restoration.

The colonel, while making a report on the gold transport, was criticised for inappropriate financial expenditures on services and some other minor "unnecessary" purchases, e.g. of headache powder.

Koc was later attacked by the Bank of Poland because he (presumably) was the only person in the ministry against gold evacuation[133] from North Africa, where it was trapped in the pro-German Vichy France colonies.