Scratched the topic of what kinda forces are participating in the battles of Ethiopia's Tigray War, the magnitude of the fighting.
On eritreahub.org I found such snippets as:
February 11-15, 2021 [...] Ethiopia’s 11th division was “destroyed” and the 32nd division was “annihilated”.
June 17-19, 2021 [...] In one battle, 3,700 soldiers of the Ethiopian army’s 11th division engaged the rebels and after three days of fighting, 100 soldiers had been killed and 900 captured, including the government troops’ commanding officer.
June 28, 2021 [...] Alex de Waal, executive director of the World Peace Foundation of Boston, said that of 20 Ethiopian federal army divisions, “seven have been completely destroyed, three are in a shambles”.
A former head of the INSA, Ethiopia’s intelligence agency, said two thirds of Ethiopia’s forces, amounting to around seven divisions, had been killed, wounded or captured within one week of the start of “Operation Alula”.
July 16, 2021 [...] Three Ethiopian regions sent soldiers to reinforce the national military and Amhara’s troops in their fight against the Tigrayan rebels
July 19-23, 2021 [...] it was reported that the Ethiopian 23rd division had been destroyed, while the operational commander of the Ethiopian military’s Eastern Command, Colonel Awel Yassin, had been captured

Also it seems the participants has regular troops, and militias.