---
title: "Territorial Defense Forces Day on October 4: How the TDF Has Changed During the Years of War"
description: "On October 4, Ukraine marks Territorial Defense Forces Day. Over the years of war, the TDF has evolved from volunteer battalions into a professional frontline military branch."
date: 2026-10-04T03:02:00.000Z
lang: en
url: https://xab.info/en/posts/territorial-defense-forces-day-october-4-how-tdf-changed
tags: [territorial-defense-forces, ukraine-war, armed-forces, military-reform]
publisher: "XAB.info"
---

# Territorial Defense Forces Day on October 4: How the TDF Has Changed During the Years of War

![Servicemen of the Territorial Defense Forces of Ukraine at positions](https://xab.info/media/2026/10/04/den-sil-territorialnoy-oborony-4-oktyabrya-kak-izmenilas-tro/den-sil-territorialnoy-oborony-4-oktyabrya-kak-izmenilas-tro-1.webp)

## 🎯 Key Points

- The TDF was established in 2021-2022 under the Law on the Foundations of National Resistance.
- Over 110,000 civilian volunteers joined the TDF in the first month of the full-scale war.
- An active scaling of unmanned systems within TDF brigades is underway in 2026.

On October 4, Ukraine celebrates Territorial Defense Forces Day. Over the past few years, the TDF has travelled an unprecedented path from a newly established branch of the military to combat units that today effectively fight on the most difficult frontline sectors and perform a wide range of strategic tasks to defend the state.

### Background and Creation of the Modern Structure

Territorial defense in Ukraine existed long before the full-scale invasion. Back in 2014, specialized territorial defense battalions began forming within the Ground Forces. A crucial milestone was the adoption of the Law "On the Foundations of National Resistance" in 2021, which provided for the creation of a separate branch within the Armed Forces of Ukraine. By January 2022, plans included deploying 25 brigades and over 150 battalions designed for a staff strength of more than 130,000 service members during a special period.

### From Civilian Professions to the Frontline

With the onset of full-scale aggression, the ranks of the TDF were massively replenished by citizens of peaceful professions—entrepreneurs, doctors, teachers, IT specialists, and engineers. In the first month alone, more than 110,000 volunteers joined the Territorial Defense Forces. TDF units stood up for the defense of Kyiv, Sumy, Chernihiv, Kharkiv, Mykolaiv, and other key cities from the very first days, and subsequently participated in strategic operations along the entire combat contact line.

### Modern Development and New Challenges

Today, the TDF represents a highly organized structure that includes infantry, mechanized units, aerial reconnaissance, and mortar crews. In June 2026, the Commander-in-Chief of the Armed Forces of Ukraine announced a large-scale reinforcement of the unmanned component in TDF brigades and the formation of specialized UAV units in the northern direction. Amidst these transformations, the main symbols of the TDF remain unchanged—the crenellated wall, the trident, the bee, and the slogan "Ready for Resistance!"

## 🔍 Fact-Check Verification

- [День Сил территориальной обороны 4 октября: как изменилась ТрО за годы войны](https://www.rbc.ua/ukr/news/den-sil-teritorialnoyi-oboroni-4-zhovtnya-1790957663.html) - Основной первоисточник статьи, содержащий детальную хронологию и статистику Сил ТрО на октябрь 2026 года.
- [Территориальная оборона в России: что это и в каких регионах вводится](https://fedpress.ru/news/77/incidents/3124807) - Подтверждено по источнику fedpress.ru
- [«Бдительности никто не теряет». Что такое территориальная оборона Беларуси и как она работает](https://ctv.by/news/obshestvo/bditelnosti-nikto-ne-teryaet-chto-takoe-territorialnaya-oborona-belarusi-i-kak-ona-rabotaet) - Подтверждено по источнику ctv.by
- [Добровольцев пока не берут. Как устроена территориальная оборона Казахстана](https://tengrinews.kz/article/dobrovoltsev-poka-ne-berut-ustroena-territorialnaya-oborona-3971/) - Подтверждено по источнику tengrinews.kz

## ❓ FAQ

### Q: When is Territorial Defense Forces Day celebrated in Ukraine?
**A:** Territorial Defense Forces Day is celebrated annually on the first Sunday of October (October 4 in 2026).

### Q: What tasks do the TDF perform today?
**A:** In addition to protecting territories and the population, TDF units directly participate in combat operations at the front, conduct aerial reconnaissance, and counter sabotage groups.