How injury and the first account shape the charge
New York does not have a separate offense called domestic assault. The charge is an assault count, often in the third degree and higher where an injury is serious or an object was used, flagged as a family offense because of the relationship. Whether there was a legally meaningful injury is frequently disputed, since a red mark, a bruise, and a fracture are treated very differently. The officers' written account, the 911 call, and anything said at the scene tend to carry real weight. Police are expected to look at who the primary aggressor was rather than simply arresting whoever called first, and sometimes both people are charged.
Self-defense and fights with two sides
Many of these cases involve injuries to both people. Justification, the legal term for self-defense, can apply when force was used against force, but it depends on what you reasonably believed at the moment and whether the force you used fit the threat. Your own injuries can matter here, so photographs taken soon afterward, records of a medical visit, and anything showing who started the physical contact are worth keeping. Messages exchanged before and after the incident often say a great deal, but do not answer new ones and do not delete old ones. Tell your lawyer about earlier incidents, earlier orders, or past calls to police, because the prosecution may already know about them.
What we look at first
We read the complaint and the order of protection together, since the order usually controls your daily life before the assault charge is decided. We sort out where you can stay, how children can be exchanged lawfully, and whether a Family Court petition has been filed or is likely. We look at the medical evidence the prosecution is relying on and what may exist on your side. We also ask about your immigration status, your work, and any firearm license, because a domestic assault conviction can carry consequences in each of those areas that people do not expect.