Is it assault to intentionally throw a piece of paper at someone at work?

[Nina2022]

Is it assault to intentionally throw a piece of paper at someone at work? An employee felt angry to receive an informal warning letter, stormed into my workspace (her manager), threw the letters at my face saying she wasn't having it and stormed out. It hit my face, with no injury, there were witnesses that confirmed it to be inappropriate.
Is it a MUST for the police to be informed?
Is it harassment?
The employee's argument is that I am bullying her with too many letters/warnings. All health or mental health possible explanations have already been explored from her end.
The thing is, I am fed up as there is constant disrespect from employees, I have made several complaints to my line managers but they do nothing about it, and now my line managers are going on about me being too harsh on her and will uphold parts of her complaint of bullying against me.
Is it an automatic reason for constructive dismissal (I am under 2 years)? If so can you please elaborate on the relevant legislation?

[ULA]

If you are under 2 years of service then unfortunately you cannot make a claim for constructive unfair dismissal.

Given that you did not sustain any injury, I do not believe that it is a must for the police to be informed, they are more than likely to see it as a workplace incident that should be dealt with by the company.

In terms of your response to this specific incident then you may want to consider raising a formal grievance against the employee in accordance with your grievance procedure.

[dslippy]

It is a very minor assault. The police need not be involved.
A right not to be dismissed unfairly only begins after 2 years service.

[atticus]

Is it a MUST for the police to be informed?

- No

Is it harassment?

- Harassment involves a course of conduct - more than one instance.

[MIKE770]

Is it assault to intentionally throw a piece of paper at someone at work? An employee felt angry to receive an informal warning letter, stormed into my workspace (her manager), threw the letters at my face saying she wasn't having it and stormed out. It hit my face, with no injury, there were witnesses that confirmed it to be inappropriate.
Is it a MUST for the police to be informed?
Is it harassment?
The employee's argument is that I am bullying her with too many letters/warnings. All health or mental health possible explanations have already been explored from her end.
The thing is, I am fed up as there is constant disrespect from employees, I have made several complaints to my line managers but they do nothing about it, and now my line managers are going on about me being too harsh on her and will uphold parts of her complaint of bullying against me.
Is it an automatic reason for constructive dismissal (I am under 2 years)? If so can you please elaborate on the relevant legislation?

Be honest you seem to have lost control of subordinates, might be time to elaborate on your position, as sounds not a one off instance, as for stating assualt by a piece of paper? suspect comment? having been manager and many different circumstances have arisen I would suggest that the job position not for you and would kindly suggest look to find another job more in line with your ability? sometime we have to be honest with ourselves!