Brown then dragged the woman into the kitchen from the lounge, ripping her clothing in the process, he said.
He then threw a toy at her, missing and smashing a kitchen window.
All the children, aged 8, 6, 4, and 2-years-old, and the youngest, 6-months-old, witnessed the assault on their mother with one stating she was going to call police, causing Brown to leave, Mr Wilson said.
He was found in a paddock nearby and declined to comment on why he had assaulted his partner.
Lawyer Jock Blathwayt said his client was intoxicated at the time and "behaved badly".
Judge Morris told Brown he needed to address his behaviour and control his drinking as it would have a serious impact on his children witnessing the violence.
"You need to understand the impact.
"It's quite clear that children who witness an event like this, they will not become the people they could be," she said.
"This has a huge impact on them.
"There are steps you need to take so you don't destroy your children."
She remanded Brown for a pre-sentence report and sentencing on January 29.