NGINX and Redirects

Hi,

I've spent a few weeks messing around with nginx to get to grips with it before I migrate my Wordpress site, (currently on Apache).

One thing can't work out is, In Apache I have a rewrite (in .htaccess) that redirects any request for

http://www.mysite.com/KB/Article/000001.htm
to
http://www.mysite.com/KB/Article/000001

It's because the site was originally written in flat html and theres thousands of links going to the old URLs.

In Apache this did the trick
-=-=-=-=-=-=-=-=-
RewriteEngine On
RewriteBase /
RewriteRule ^KB/Article/(.*).htm  http://www.mysite.com/KB/Article/$1 [L]
-=-=-=-=-=-=-=-=-

How Do I do the same thing in nginx? I'm assuming I add the redirect to my
/etc/nginx/sites-enabled/default
File, as that the one the test site is using;

-=-=-=-=-=-=-=-
# Default server configuration

server {
      listen 80 default_server;
      listen [::]:80 default_server;

# Set The Root Directory for the Entire Website

      root /var/www/html/;

# Add index.php to the list if you are using PHP

      index index.html index.htm index.nginx-debian.html;

# Add The Server IP Address or FQDN

      server_name 123.123.123.123;

# The following does the WorkPress Rewrites for the permalinks
      
      location / {
        index index.php index.html index.htm;
        try_files $uri $uri/ /index.php?$args;
   
      }

# pass PHP scripts to FastCGI server

       location ~ \.php$ {
    fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
    include snippets/fastcgi-php.conf;
  }
}
-=-=-=-=-=-=-=-

A) What do I need to add to replicate that Apache/.htaccess redirect.
B) Is there anything you would recommend I add/remove from the above config file.

Thanks in advance

Pete